ML17285A351

Special Rept:On 890306,post-accident Sampling Primary Coolant Radiation Monitor Inoperable.Caused by Excess Moisture.Pass Vacuum Pump PSR-P-702 Replaced W/New Pump & Bulkhead Fitting Repaired

ML17285A351
Person / Time
Site:	Columbia
Issue date:	03/22/1989
From:	Powers C WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 8904050343
Download: ML17285A351 (6)

Text

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ACCESSION NBR:8904050343 DOC.DATE: 89/03/22 NOTARIZED: NO FACIL:50-397 WPPSS Nuclear Project, Unit 2, Washington Public Powe AUTH.NAME AUTHOR AFFILIATION POWERS,C.M.

Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILIATION MARTIN,J.B.

Region 5, Ofc of the Director

SUBJECT:

Special rept:on 890306,post-accident sampling primary coolant radiation monitor inoperable.

DISTRIBUTION CODE:

AOOID COPIES RECEIVED:LTRj ENCL +

SIZE:

TITLE: OR Submittal:

General Distribution NOTES:

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P.O. Box 968

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~ I ARZ7 A 9: P3 Docket No. 50-39/

March 22, 1989 Nr. J.B. Martin Regional Administrator

USNRC, Region V

1450 Maria Lane, Suite 210 Walnut Creek, CA 94596

SUBJECT:

NUCLEAR PLANT NO.

2 LICENSE NO.

NPF-21 SPECIAL REPORT'OST-ACCIDENT SANPLING PRIHARY COOLANT RADIATION NONITOR

REFERENCE:

Letter, GC Sorensen (SS) to JB Hartin (NRC), "Special Report:

Post-Accident Sampling Containment Atmosphere Radiation Monitor,"

Dated February 16, 1989 This special report is submitted pursuant to the requirements of WNP-2 Technical Specification Table 3.3.7.5-1 (Instrument No. 29:

Post Accident Sampling Primary Coolant Radiation Monitor), Action Statement 81.

Action Statement 81 requires, "with the number of operable accident monitoring instrumentation channels less than required by the minimum channels operable requirement, either restore the inoperable channel(s) to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, or:

(a)

Initiate the preplanned alternate method of monitoring the appropriate parameter(s),

and (b)

In lieu of any other report required by Specification 6.9.1 prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within 14 days following the event outlining the action taken, the cause of the inoperability and the plans and schedule For restoring the system to operable status."

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PASS REPORT PAGE 2

In the referenced letter, the Supply System reported that Post Accident Samp-ling System (PASS) vacuum pump PSR-P-702 (Suppression Pool Atmospheric Sample Return) was inoperable

and, as a result, Post Accident Sampling Containment Atmospheric Radiation Monitor PSR-RI-704 was unable to perform its function as required by the Technical Specifications.

Also in the letter, the Supply System provided the plans and schedule For restoring the system to operable status and committed to provide an evaluation of the failure mode of the vacuum pump.

On March 6, 1989 as part of the repair efforts associated with PSR-P-702, it was necessary to remove the entire PASS from service

and, as a result, the other Technical Specification instrument in the system (PSR-RI-665:

Post Accident Sampling Primary Coolant Radiation Nonitor) was also not able to perform its required function.

In the event of an inoperable PASS during accident conditions, the alternate preplanned method for assessing core damage is Plant Procedure

( PPN) 9.3.22, "Core Damage Evaluation."

Included in this procedure are evaluations of water level history, installed radiation monitor indication and hydrogen content in the containment atmosphere.

During the disassembly of PSR-P-702, water was discovered in the pump above the reed valve, which prevented the pump from establishing a vacuum (subsequent bench testing revealed that there were no mechanical problems with the pump).

The PASS procedure requires purging Following pump operation to remove any moisture From the sample piping.

However, due to a loose bulkhead fitting inside Sample Rack PSR-SR-06, there was insufficient flow available in the nitrogen purge supply line to adequately purge the water in the line.

Therefore, the excess moisture had 'settled in the pump.

Regarding restoring the system to operable status, PSR-P-702 was replaced with a

new pump and the bulkhead fitting repai'red.

Current plans are to have the system aligned, tested and returned to service by Narch 31, 1989.

Very truly yours, gal' C.M.

Powers (M/D 927M)

WNP-2 Plant Manager cc:

Mr. C.J.

Bosted, NRC Site (N/0 901A)

Ns. Dottie Sherman, ANI Nr. D.L. Williams, BPA (N/D 399)

Document Control

Desk, NRC

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