PNO-IV-90-024, on 900628,Steam Generator D PORV Found to Have Congealed Electro Hydraulic Control Fluid.Caused by Heat & Moisture from body-to-bonnet Steam Leak on Porv.Reactor Shut Down

PNO-IV-90-024:on 900628,Steam Generator D PORV Found to Have Congealed Electro Hydraulic Control Fluid.Caused by Heat & Moisture from body-to-bonnet Steam Leak on Porv.Reactor Shut Down

ML20055D962
Person / Time
Site:	South Texas
Issue date:	07/06/1990
From:	Joel Wiebe NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:
References
PNO-IV-90-024, PNO-IV-90-24, NUDOCS 9007100197
Download: ML20055D962 (2)

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$w. '.? PilEllMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-IV-90-24

[This preliminaryf notification constitutes EARLY notice of-' events of POSSIBLE n l safety or public interest" significance. ; The information is' as- initially received p withoutl verification or evaluation, and is basically all that.is known by the s Region lY staff on this-date.--

x FACILITY':lHoust'on Lighting & Power Co. Licensee Emergency Classification:

T South: Texas Project Unit 2 Notification of Unusual Event Alert.

Docket:- 50-499.

Site Area Emergency General Emergency

_X_,Not Applicable

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SUBJECT:

SHUTDOWN GREATER THAN 72 H0VRS (OnlJune'28,,1990, the "D" steam generator power operated relief valve (PORV) was h ;found: to have congealed electro hydraulic control -(EHC) fluid. The PORY was M"

declared" inoperable.at 9:20 p.mL the same day and a 7-day LC0 was entered. The-6cause of the congealed EHC fluid was-found to be the heat and moisture.from a ibody-to-bonnet steam leak on.the PORV. This type of EHC fluid-(Fyrquel 220) is.

known to rapidly polymerize with the presence of heat, moisture,-and' copper.

-During work on:the.PORV, it was>also noted that the piston for the nitrogen n ' accumulator had-jammed which effectively removed the: nitrogen buffer and caused.

mthe EHC~ pump to rapidly cycleon and off. This condition may have'added additional heat;to assist in the polymerization of the EHC fluid. - On July 5,--

' r1990,'the licensee determined that the PORV could not be repaired prior to the-N .

, expiration mainiturbine of that:was the-LCOrunning time clock.-..(They further hot 223*F versus determined a normal that abe 180'F)ishould bearing on the-repaired. ' At 8:14;p.m. on July 5,1990, the generater was taken' off the grid and the. reactor shutidown prior to reaching the end~ of. the LCO' time clock.

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'The plant is expected to remain shut down for 8 days to replace the main turbine ibearing. 0ther work to'be performed includes repair of a tachometer 3 card'on Main

' Feed Pump (MFP) 21,. repair of an EHC leak on MFP 23, repair of the steam leak and accumulator piston on "D" steam generator PORV, and repair of an undervoltage-relay channel on ESF bus "A;"

y Neither;the licensee nor the NRC plans to.is.,ue'a-press release.

dhe'stateof~Texaswill.beinformed.

[* 1 RegionLIV received 1 notification of this occurrence by telephone from the SRI at.2:30'p.m. (CDT) on July 5, 1990. Region IV-has informed E00/NRR..

> ThisE 1 formation has been confirmed with a licensee representative.

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CONTACT: J. S. Wiebe .

FTS: 728-8287

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