ML20140G325

PNO-74-136:on 741124,during Startup Tests of Main Steam Relief Valves at 75% Power,Target Rock Safety Relief Valve Failed to Reseat.Cause Not Stated.Valve Will Be Replaced

ML20140G325
Person / Time
Site:	Browns Ferry, 05000000
Issue date:	11/27/1974
From:	Jennifer Davis, Gower G, Thornburg H US ATOMIC ENERGY COMMISSION (AEC)
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FOIA-85-665 PNO-74-136, NUDOCS 8604020167
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l No. 136 Date: 11/27/74

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DIRECTOPJdE OF REGULATORY OPERATIONS NOTIFICATION OF AN INCIDENT OR OCCURRENCE Facility: TENNESSEE VALLEY AUTHORITY (BROWNS FERRY 2, BWR REACTOR)

DOCKET NO. 50-260 Problem: MALFUNCTION OF SAFETY RELIEF VALVE On November 25, 1974, TVA telephoned Regulatory Operations, Region 'II (Atlanta) concerning the failure of one Target Rock safety relief valve to reseat on November 24, 1974. The following.information was reported:

1. During the startup tests of the main steam relief valves (RV's) at 75% power, one of the eleven Target Rock RV's failed to reseat after being lifted manually. Subsequent exercising of the valve failed to cause it to reseat. The reactor was manually tripped about 10 minutes af ter the RV malfunctioned. The RV remained open for approximately 15 minutes and reseated automatically when the reactor coolant system pressure had decreased to approximately 580 psig.

2. The residual heat removal systen (RHRS) was f wnediately initisted in the torus cooling mode and the torus water temperature did not

, exceed 1040F.

3. There was no detectable release of radioactivity associated with the incident.

4. The RV will be disassembled to determine the cause of failure and a Target Rock representative will be on site the week of December 2, 1974, to observe the disassembly. The RV in question will be replaced with a valve from Unit 3. During heatup the valve will be tested at rated temperature and pressure to verify proper lif ting and closure.

5. The RV's are designed to discharge below the surface of the water in the torus. An internal and external inspection of the torus will be conducted for any signs of damage by the RV blowdown.

6. TVA expecto to restart the reactor with a spare valve by November 29 or 30, 1974.

7. TVA will notify Region II, prior to restarting the reactor, concerning the status of their inspections and corrective actions.

Action Taken By Regulatory Operations l

{

l. Further action by RO will be bdsed on the valve inspection results ,

and identification of the cause of the malfunction.

B604020167 860114 PDR FOIA

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FIRESTOBS-665 PDR

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No. 136 . Date: 11/27/74

2. Region II and TVA have issued a press release on this occurrence.

3. The assistanto to the Commissioners, the staff of the Joint '

Committee on Atomic Energy and the Office of Information ,

Se'rvices have been notified by telephone. ,

Contact:

Further information concerning this occurrence can be obtained from:

G. C. Gower - X7353 H. D. Thornburg- X7353 ,

J. G. Davis - X7541' -

Distribution:

Chairman Ray 4 E. G. Case, L Commissioner Kriegsman F. Schroeder, L

• Commissioner Anders D. J. Skovholt, L L. M. Muntzing, DR A. Giambusso, L A. W. Jackson, ATDR H. Larson, L .

L.'V. Gossick, ADR K. R. Coller, L H. H. Brown, DRGL . S. A. Schwartz, DRGL S. H. Hanauer, DRTA H. C. Kouts, RSR E. G. Triner, D?St. R. S. Ecyd, L D . J. Donoghue, DRA .A. R. Rosenthal, ASLAF W. G. Dooly, DRA S. H. Smiley, L General Manager (2) D. R. Muller, L Secretary (2)

_, -R.-- L; Tedesco, L F. Ingram, IS H. R. Denton, L (2)

~

J. Fouchard, IS ,

D. A. Nussbau=er, L J. A. Harris , IS R. E. Cunningham, L .

Clare Miles, IS G. W. Kerr, L .

J. D. Anderson, INS B. Singer, L M. Biles, OS -

L. I. Cobb,-RO R. F. Fraley, ACRS (18) D. F. Knuth, RO '

L. Rogers, RS ,

J. G. Davis, RO R. Mattson, RS , H. D. Thornburg, RO -

J. A. Arletto, RS ,

T. R. Wilson, RO

• J. J. Davis, RS , D. Thompson, R0(2)

R. G. Smith, RS B. H. Grier, RO (2) .

R. S. Brodsky, NR G. W. Reinmuth, RO W. MacDonald, OPS K. V. Seyfrit, R0 (4)

J. L. Liver =an, DBER J. Sniezek, RO (4) ~

S. Levine, OEA C. W. Kuhl=an, RO DR Central Files ,

J. Whitcaker, R0 (1)

RO Files R. D. O'Neill, OCR PDR (4) W. H. Weysen, DBER

. E. J. Bauser, JCAE RO Regional Offices

. B. F. Faulkenberry, R0 DR Reading Files B. Tharp, Security _7 L . JoSMlz,& n

D 4r../1-1.

>PROCESSINGC DISPLAY 4/0/1-1 ,

DIS '4/0/000001-000001//1

<ACCESSIt'N NO.> OOV0072532

< TITLE) BLOWDOWN INCIDENT AT GERMAN BWR WUERGASSEN

<DATE> 1972

< TYPE > M

< MEMO > 1 PAGE,' NUCLEONICS WEEK, 13(16), PP. 4 (APRIL 20, 1972)

<CATEOORY) 170000;110000

< EDITION > 0043

< COUNTRY > A 4 <AB5 TRACT > DURING STARTUP TEST 5 AT WUERGASSEN, A 670 MW(E) BOILING WATER REACTOR IN WEST GERMANY, A RELIEF VALVE OPENED AND COULD NOT BE CLOSED ALLOWING STEAM BLOWDOWN TO THE SUPPRE55 ION CHAMBER. OPERATOR 5 TRIED TO REDUCE THE POWER SLOWLY TO AVOID THERMAL STRE55 ON THE VE55EL DUT THE TEMPERATURE INCREA5ED IN THE SUPPRESSION CHAMBER AND PRES 5URE FUL5ATIONS RESULTED WHICH CREATED A LEAK IN THE CHAMBER BOTTOM. WATER ESCAPED INTO LOWER PART OF 5AFEeY LUNTAINMENT WHEREUPON REACTOR WAS SH'JT DOWN OUIChLY.

I REPAIRS WILL TAKE ABOUT 2 MONTH 5.

< KEYWORD 5> REACTOR, BWRfCONTAINMENT, PRES 5URE SUPERE5510N; FAILURE, EQUIPMENT:

GERMANYiINCIDENT, EOUIFMENT; PRE 55URE RELIEFiREACTOR STARTUP EXPERIENCE:

BLOWDOWNiLEAK; VALVE 5 ENTER:

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