ML18347B142

LER 1978-028-00 for Palisades Plant Re Containment Building Purge Valve T-Ring in CV-1806 Was Not Pressurized

ML18347B142
Person / Time
Site:	Palisades
Issue date:	08/18/1978
From:	Hoffman D Consumers Power Co
To:	James Keppler NRC/RGN-III
References
LER 1978-028-00
Download: ML18347B142 (3)

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company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201

• Area Code 517 788-0550 August 18, 1978 C:J

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Mr James G Keppler fTI <::)

Office of Inspection and Enforcement en 0 G ,

Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255 - LICENSE DPR PALISADES PLANT - LER 78-028 Attached is a Licensee Event Report for the Palisades Plant.

David P Hoffman Assistant Nuclear Licensing Administrator CC: Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (7-77)

LICENSEE EVENT REPORT CONTROL BLOCK: I I0 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

[9E I Ml rl PI A IL I ll@I o Io I -I o Io Io Io Io I - Io Io 101 411I1I1I1 1©1 I I© 7 8 9 LICENSEE CODE 14 ~5 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T

[ill]  :~~~~~ ~(o I 51 o Io Io I 21 51 5 IG)I o I 81 o I 41 7 I 81@1o18 11 I 81 718 JG) 7 8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 AEPOAT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

I During testing of ~ontainment building purge valve T-ring air supply l:ITIJ I systems, it was found that the T-rin,g in cv:...1806 was not press1iri zea I Subsequent testing revealed that one valve in series with CV-1806 did not have a. sufficient supply of air to maintain pressure in its T-ring for r:£:))] I 30 days. As a result, containment integrity requirements of TS 3.6 were

~ I degraded. The T-ring air supply was restored to CV-1806.

((ill 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUB CODE SUBCODE IIITl I s1 DI@ W@ L£.J@ I VI Al LI v IE I x1@ w@ L.£J 7 8 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE AEPOAT REVISION*

~ LEA/RO CVENTYEAA REPORT NO. CODE TYPE NO.

v..:.J REPORT NUMBER I 71 8 I I I IOl218J L:::::J lol1I l.1'.J [.=J LQJ 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ~ ATTACHMENT NPAD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FOAM :;us. SUPPLIER MANUFACTUAEA W@~@

33 34 L!J@

35 L!J 36 1010101 37 40 I LIJ@

41 1.!J 42 L!.J@)

43 I c1 518171@

44 47 CAUSE DESCRIPTION AND CORREC"rJVE ACTIONS @

I Incorrect reassembly of the air supply to CV-1806 after a special test of IIIIJ I the T-ring air supplies in April 1978 was the cause of this occurrence.

CLIII I After restoration of the air supply, the remaining purge valve T-ring

((IT] I air supplies were tested; all had normal air pressure.

1 o::m 0 s 80 FACILITY STATUS  % POWER - OTHER STATUS tJo'I

\::::J METHOD OF DISCOVERY DISCOVERY DESCRIPTION ~

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[ill] LQJ@ I o I o I o l@) I....._N....../_A_ _ __ LQJ~I Operator observation 8 9 10 12 13 44 45 . 46 80 ACTIVITY CONTENT

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AELEASEO OF RELEASE I AMOUNT OF ACTIVITY~ LOCATION OF RELEASE @

[ill]~@ ~@IN A I N/A 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES r.;;::.,

ITI2J NUM,l!ER ~ TY,..t'E (.;;;\ DESCA)PTION 101UI01'8L:'.J~.._N_;_A 1 0 s 11 12 13 80 PERSONNEL INJURIES c:;.,

NUMBER OESCAIPTIONl!2J

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1 a g 11 12 80 LOSS OF OR DAMAGE TO FACILITY f.i3\

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'Attachment to LER "-028/0lT-O

• Consumers Power Company Palisades Nuclear Plant Docket 50-255 In order to demonstrate that the containment building purge valve T-ring air supplies could meet the 10 CFR 50, Appendix J, requirement that they be able to maintain T-ring pressure for a minimum of 30 days, a test of the air supplies was conducted. On August 4, 1978, while making preparations to.

test the air supply to the T-ring of CV-1806 (Purge Exhaust Valve), it was found that its T-ring was depressurized. Because valve operability is depe.pendent on having a pressurized T-ring to maintain a proper seal, the containment integrity requirements of Technical Specifications 1.4 and 3.6 were not met. Investigation revealed that the T-ring air supply line had been connected to a fitting which was not a source of air. This condition occurred on April 7, 1978 during reconnecting of the air supply lines after a modification had been made to the T-ring air supply system. To correct the condition, the T-ring and its associated accumulator were repressurized and tested satisfactorily.

Subsequent testing of the remaining valves showed that one valve in series with CV-1806 did not have a 30-day supply of air to its T-ring. In deter-mining if a 30-day supply of air existed, credit was taken for only the air contained in the T-ring's air supply accumulator. Since the T-ring is normally pressurized from an alternate (nonseismic) air source, pressure could have been maintained (or restored) to the T-ring of the valve in series with CV-1806, in the event of a postulated DBA. As a result, the integrity of the containment boundary, although degraded, had been maintained during the period from April 7 to August 4, 1978 and could have been maintained under accident conditions.