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NRC v3T. ,UTION FOR PART SO DOCKE . E. IRI AL(TEMPORARY FORM)-

CONTROL NO:1031h'

FILE: INCIDENr RErenT ?IL.1.

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FROM: Metropolitan Edison Co. DATE OF DOC DATE REC'D LTR TWX RPT OTHERReading, PA.F.C. A moli 0-26-79 o-2c 75 :CCC

TO: ORIG CC OTHER SENT AEC POR :CCC

1 ci $a SENT LOCAL POR :cc'o?PC

CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

:CCC 1- 50-289

DESCRIPTION: ENCLOSURES:*

Abnor:::al Occurrence # 75-32, on 9-18-7s, Concerr ing'

Two Manual Isolation Valves in the Air SuppIy~

Lines for the Reactor Eldg. Personnel Access Ha-ch .

Door Found in the Closed Position Durning Non-Te sting

Conditions......... ,

(1 Copy Enclosure Received)

PLANT N AME: Three Mile Island f 1.

FOR ACTION /INFORMATION SA: 10-1-7c

BUTLER (L) SCHWENCER (L) ZIEMANN (L) REG AN (E)W/ Copies W/ Copies W/ Copies W/ Copics

g g oWLEDGrDr.CLARK (L) STOLZ (L) DICKER (E) / LEAR (L)W/ Cocies W/ Copies W/ Cocies WO Copies

PARR (L) VASSALLO (L) KNIGHTON (E) SPELSW/ Copies W/ Copies W/ Copics W/ Copies -n

KNIEL (L) PURPLE (L) YOUNGBLOOD (E) yI g y'~R' 3 N/LW/ Copics W/ Copies W/ Copics W/ Copics -

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. INTERNAL DISTRIBUTION

MG F f L3 TECH REVIEW DENTON LIC ASST A/T IND .

hNHC POH ,.SCH R O E D E R yGRIMES R. DIGGS (L) B R AITHANOGC, ROOM P 506A 4'M ACCA RY GAMM"' H. GE ARIN (L) SALTZMANGOSSICK/ST AF F KNIGHT KAS'~ E. GOULBOURNE (L) MELTZCASE P AWLICKI BALL.~J P. KREUTZER (E)fGI AM BUSSO SHAO SPANG LE R J. LEE (L) PLANS

BOYD ** . STE L LO M. RUSHER 00K (L) MCDONALD-

MOORE (L) **fHOUSTON ENVIRO S. REED (E) CHAPMAN,,NOVAK MULLER M. SE RVICE (L) DUBE (Ltr)DEYOUNG (L) **

SKOVHOLT (L) ,.ROSS DICKER S. SHEPPARD (L) E. COUPE

GOLLER (L) (Ltr) lPPOLITO KNIGHTON M. SLATER (E) PETERSONf

P. CO L LINS /TEDESCO YOUNG B LOOD H. SMITH (L) HARTFIELD (2)/ . TEETS (L) ,KLECKER

DENISE J. COLLINS REGAN S

REG OPR LAIN AS PROJECT LOR G. WI LLI AMS (E) EISENHUT

/''Fil E & REGION (2) BENAROYA V. WILSON (L) *WIGGINTON,,."IPCfPE [3) ,VOLLMER HARLESS R. INGRAM (L) F. WILLI A'4s

STEELE M. DUNCAN (E) -HAUUnEXTERNAL DISTRIBUTION

1 - LOCAL PDR Earrisburg, PA.l - TIC (ABERNATHY) (1)(2)(10) - N ATION AL LABS 1 - PDR SAN /LA/NY

f,,1 - NSIC (BUCH AN AN) 1 - W. PENNINGTON, Rm E-201 GT 1 - BROOKH AVEN NAT LAB

1 - ASLB 1 - CONSU LTANTS 1 - G. U LRIKSON, O RN L

1 - Newton Anderson NEWM ARK /B LUM E/AG B ABI AN 1 - AGMED (RUTH GUSSM AT."

Aa- ACRS SE:r To LIC ..SST S. Teets Rm B 127 GT .,

** SEND ONLY TEN DAY REFORTS A' i-: J. D. RUNKLES, Rm E-201v- GT

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147 291' ~ ' 291ono 9gy

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METROPOLITAN EDISON COMPANY

PcCT CFFICE SOX 542 REACING. PENNSYLVANI A 10603 TELEPHONE 215 - 929G01

September 26, 1975GQL 15h2

Director gle C#Division of Reactor Licensing Regulat00 -

U.S. Nuclear Regulatcry Ccnmissicn'4ashingten, D.C. 20555 1

Dear Sir:

Docket No. 50-289Operating License No. DPR-50

1.. accordance with the Technical Specifications cf cur Three Mile Island NuclearStation Unit 1 (TMI-1), ve are reperting the felle, wing abnormal cccurrence.

(1) Report Number: A0 50-289/75-32i|t,-v

\. \(2a) Repcrt Date: September 20, 1975 c<f,\

a /,

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1[N Qjfo*Dc

(2b) Occurrence Date: September 13, 1975 g4 m,s.* j/$f-

(3) Three Mile Island Nuclear Staticn Unit 1, .o . ~

(h) Identification of Occurrence: C. *d''wQ'#few

Vc A 4?so Nanual Isolatien 7alves in the Air Suppki Ci:ne--ft:\ tte/'/ c'

Title:Reactor Euilding Personnel Access Hatch Decr hu 1.2MneClcsed Fcsiticn During Ncc-Testing Conditicns.

Type: An abncrmal cccurrence as defined by the Technical Specifications,paragraph 1.3g, in that these two isclaticn valves being ir theincorrect pcsition constituted an inadecuacy in the implementationof procedural centrols that threatened to cause an unsafecondition in the cperation of the plant.

(5) Ccnditions Frior to Cccur <nce

Fever: Core: 100%F.le c t . . Sho M'4e (Gress)

RC Flew: 138 x 10 lb/hr

~{ }}2RC Fress.. 2155 psig. [CRC Temp.- 579 F

FR",R Level. 220 inches A., f4s

s .o. .a t %. ,<;;C.rC .a r s--y. wss

_

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(6) Description of Occurrence:.

Cn September 18, 1975, at 0350 hcurs, while performing a Reactcr BuildingPersonnc2 Access Eatch Docr Seal Leak Test (SP 1303-11.18 Section A), theoperator checked the valve lineup for the air supply to the decr seals.He fcund that tvc normally cpen valves (PP-V kT and 179) were in theclcsed pcsition.

These valves were opened immediately and the correct pcsitiens of othersbnilar valves in the E=ergency Access Hatch were verified. A leak testwas performed and the results were satisfactory.

(7) Designation of Apparent Cause of Occurrence:

The apparent cause cf this cccurrence was perscnnel in that thesur elllance procedure (SP 1303-11.15) required that the subject valvesbe re-opened after any testing which would require their cicsure andthe precedure was apparently not folicved.

(8) Analysis of Occurrence:

It is considered probable that PP-V kT was c1csed since September 10,1975, when the recorded data began to consistently indicate no hatchleakage.

The closure of PP-V-kT would have prevented autenatic pressuricaticn oft'e door seals if an Energency Safeguards actuation veuld have cccurred.If PP-V-179 had been cicsed during a period when PP-V kT was still open,any decr seal tests veuld have verified leak tightness of the innerhatch decr only. There is no way cf verifying the pcsiticn of PP-7-179during this time pericd therefcre, it must be assumed that all leaktests en the Reacter Euilding Personnel Access Hatch Docr Seals , duringthe time when PP-7 kT was closed, were invalid because the test airsupply could not reach either the inner er cuter decr seals.

It has been determined that there was no threat to the health and safetyof the public in that:

a. the leak rate test performed fc11cving disecvery of thisimproper valve lineup was satisfactcry and was perfer edwith no adjusteents cr repairs pricr to cr follevingtesting, indicating good seal condition and,

b. although, the decr seal interspace cculd nct be pressurized,due to this improper valve lineup, leakage past the decr sealsin the event a LOCA had cccurred vculd have been negligible,since both decr seals were in good condition as indicatedby testing.

}476 293(9) corrective Actien:

In addition to tha 4--adiace corrective actions listed above long terncorrective actions will be or have been taken as indicated belev:

a. Initiated Tempcrary Preced"*a F"ange to require verifyingthe pcsition of the valves in air lines to the decr sealsprior to each leak test.

-3-.

b. Initiated verk request to install locking devices on thevalves inside the perscnnel and emergency access hatch,-

.

c. Will place applicable valves en the plant locked valveslist when the locking devices are installed, and willthen cancel the tenpcrary require =ent to verify valve pcsitionsprior to each leak test.

The Plant Crerations Review Ccmaittee and Station Superintendent havereviewed and approved the above corrective acticns and have taken stepsto assure ecmpleticn of the yet to be ccepleted long ter ccrrectiveactions.

(10) Failure Cata:

"cne

Similar Occurrences:

None

Sincerely,

s.,>/ j

R. C. Arn 1dVice President

RCA:CWS:llt

File: 20.1.1/7 7.3.5.1

cc: J. P. O'Reilly

Office of Inspecticn and Enforcement, Region I

1476 294

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SU3Sf3fARY Cf GENERAL PUCLIC UTILlI!EC CCSPt'RA rtC. ,

POST OF'::OE SOX 480MICOLETOWN. PENNSYLVANIA

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17c57 TELEPHONE 717-G44-4 Cm

Septe.bor 19, 1975

Tir. J. P. O'ReillyDi actnrate ci Pcgiatory Operations

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o~ ,s@M{f{g;!| \-

Phn4e - 'em,, c. , n ., 0 D~

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631 Park AvenueKing c? Prussia Pa.. 19C5

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Operating License C??.-50Ecchet 50-239

Subject: Abno-'al Occurrence No. 75-32Daar ifr. O'Reilly:

cad J. J. Celitz (TMI Unit 1 Su; crintendent) at 1030 hours, Septer.bar 12This telegram is to confim the telecen botxcen A. N. Fasano (NSn 1 ??C)-

;973.

of the Technical Specifications.The fo!Icwito recort is sub7itted in accordance with paragraph 14d (page I C),-

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On Septer':er 10,1C75 at 0350 while cerforninqAccess Mtch Ccor Seal tr-% Test (SP a ?.eacter Puildino P~ - nnai1303-11.10checked the valva lia.cuo for the air croly to the decr seals.S:ctica A) tna ccora ort <o (C) nor ally caen valves wer: Me -icu.-d that

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these valves and satisfactority cce.o?eted the seal testin the ciened eosition.He prc:?t.y openee.

This etnor%1;

decr seals in the event that an E.S. ccndition tcd cccurredvalve lincu? auld have orcvented aut:c atic rf essurizat'on of.

Previous len't

r.2y have Penn ir;>'. lid f r tha t4 2 ter'cd curire !-ich t'aredfcct vritests en the P.eacter CuiMire ?creennel Access M:tch C:ce 50ciswara clon:d.have been closed since Sepec-terRevie.s of 'rev%us est osults indicated that these valves mv. m

10, 1973.The c.crgency air 1valves scre verificd to be in the proper cositicn.00% deer 3031s were test 9 satisfacterily and the arsccicted

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