ML19210A239

Abnormal Occurrence 50-289/75-32:on 750918,incorrect Open Position of Air Supply Valves PP-V-47 & 179 Could Have Prevented Proper Functioning of Door Seals in Event of Emergency Safeguards Actuation.Jj Colitz Encl

ML19210A239
Person / Time
Site:	Three Mile Island
Issue date:	09/26/1975
From:	Arnold R METROPOLITAN EDISON CO.
To:
References
GQL-1542, NUDOCS 7910240951
Download: ML19210A239 (5)

Text

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NRC v3T.

,UTION FOR PART SO DOCKE. E.

IRI AL (TEMPORARY FORM)

CONTROL NO:1031h FILE: INCIDENr RErenT ?IL.

1.

FROM: Metropolitan Edison Co.

DATE OF DOC DATE REC'D LTR TWX RPT OTHER Reading, 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

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?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

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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)

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PLANS BOYD

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MCDONALD MOORE (L)

• • fHOUSTON ENVIRO S. REED (E)

CHAPMAN

,,NOVAK MULLER M. SE RVICE (L)

DUBE (Ltr)

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~r* r:n ~xnss METROPOLITAN EDISON COMPANY PcCT CFFICE SOX 542 REACING. PENNSYLVANI A 10603 TELEPHONE 215 - 929G01 September 26, 1975 GQL 15h2 Director gle C#

Division of Reactor Licensing Regulat00 U.S. Nuclear Regulatcry Ccnmissicn

'4ashingten, D.C.

20555 1

Dear Sir:

Docket No. 50-289 Operating License No. DPR-50 1..

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

(1)

Report Number: A0 50-289/75-32 ilt,-v

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

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(2b) Occurrence Date: September 13, 1975 g4 m,

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Three Mile Island Nuclear Staticn Unit 1

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Identification of Occurrence:

C.

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

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Title:

Reactor Euilding Personnel Access Hatch Decr hu 1.2Mne Clcsed 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 the incorrect pcsition constituted an inadecuacy in the implementation of procedural centrols that threatened to cause an unsafe condition 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

~{2 RC Fress.. 2155 psig. [ C RC Temp.- 579 F FR",R Level. 220 inches A., f 4 s s.o..a t ,<;;C.r C .a r s--y. wss

(6) Description of Occurrence: Cn September 18, 1975, at 0350 hcurs, while performing a Reactcr Building Personnc2 Access Eatch Docr Seal Leak Test (SP 1303-11.18 Section A), the operator 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 the clcsed pcsition. These valves were opened immediately and the correct pcsitiens of other sbnilar valves in the E=ergency Access Hatch were verified. A leak test was performed and the results were satisfactory. (7) Designation of Apparent Cause of Occurrence: The apparent cause cf this cccurrence was perscnnel in that the sur elllance procedure (SP 1303-11.15) required that the subject valves be re-opened after any testing which would require their cicsure and the 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 hatch leakage. The closure of PP-V-kT would have prevented autenatic pressuricaticn of t'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 inner hatch decr only. There is no way cf verifying the pcsiticn of PP-7-179 during this time pericd therefcre, it must be assumed that all leak tests en the Reacter Euilding Personnel Access Hatch Docr Seals, during the time when PP-7 kT was closed, were invalid because the test air supply could not reach either the inner er cuter decr seals. It has been determined that there was no threat to the health and safety of the public in that: a. the leak rate test performed fc11cving disecvery of this improper valve lineup was satisfactcry and was perfer ed with no adjusteents cr repairs pricr to cr folleving testing, 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 seals in the event a LOCA had cccurred vculd have been negligible, since both decr seals were in good condition as indicated by testing. }476 293 (9) corrective Actien: In addition to tha 4--adiace corrective actions listed above long tern corrective actions will be or have been taken as indicated belev: a. Initiated Tempcrary Preced"*a F"ange to require verifying the pcsition of the valves in air lines to the decr seals prior to each leak test. b. Initiated verk request to install locking devices on the valves inside the perscnnel and emergency access hatch, c. Will place applicable valves en the plant locked valves list when the locking devices are installed, and will then cancel the tenpcrary require =ent to verify valve pcsitions prior to each leak test. The Plant Crerations Review Ccmaittee and Station Superintendent have reviewed and approved the above corrective acticns and have taken steps to assure ecmpleticn of the yet to be ccepleted long ter ccrrective actions. (10) Failure Cata: "cne Similar Occurrences: None Sincerely, s. >/ j R. C. Arn 1d Vice 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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.e. e. %.* %~n s 4 s m, \\,A,s... r / SU3Sf3fARY Cf GENERAL PUCLIC UTILlI!EC CCSP POST OF'::OE SOX 480 MICOLETOWN. PENNSYLVANIA 17c57 TELEPHONE 717-G44-4 Cm Septe.bor 19, 1975 Tir. J. P. O'Reilly Di actnrate ci Pcgiatory Operations o~ ,s@M{f{ g

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0 D ~ u ,, 2 631 Park Avenue King c? Prussia Pa.. 19C5 Operating License C??.-50 Ecchet 50-239

Subject:

Abno-'al Occurrence No. 75-32 Daar ifr. O'Reilly: cad J. J. Celitz (TMI Unit 1 Su; crintendent) at 1030 h

973.

of the Technical Specifications.The fo!Icwito recort is sub7itted in acc On Septer':er 10,1C75 at 0350 while cerforninq Access Mtch Ccor Seal tr-% Test (SP a ?.eacter Puildino P~ - nnai 1303-11.10 checked the valva lia.cuo for the air croly to the decr seals.S:ctica A) tna ccora or t <o (C) nor ally caen valves wer: Me -icu.-d that 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 cc Previous len't r.2y have Penn ir;>'. lid f r tha t4 2 ter'cd curire !-ich t'are dfcct vritests en the P.eacter CuiMire ?c wara clon:d. have been closed since Sepec-terRevie.s of 'rev%us est osults indicated that the . m 10, 1973. The c.crgency air 1 valves scre verificd to be in the proper cositicn.00% deer 3031s were test r- \\ Ob '}}