ML20028A522

LER 82-108/03L-0:on 821010,safety Relief Valve 1B21-F013J Failed to Reclose Until 50-100 Psig Reactor Pressure Reached.Caused by Faulty Spring within Solenoid Valve. Defective Solenoid Valve & Valve Pilot Assembly Replaced

ML20028A522
Person / Time
Site:	Brunswick
Issue date:	11/12/1982
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028A517	List: ML20028A516 ML20028A522
References
LER-82-108-03L-02, LER-82-108-3L-2, NUDOCS 8211220259
Download: ML20028A522 (2)

Text

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NRC FOIM 366 L'. S. NUCLE AR REGULATC"eY COMMIS$10N (7-77)

.. LICENSEE EVENT REPORT

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CON THOL tsLOCK: l l l l l l l (PLEASE PRINT 03 TYPE ALL REQUIRED INFORMATION) 1 6 lo 11l lN lC lB lE lP l1 l@l0 l0 l- l0 l0 l0 l0 l0 l- l0 l0 l@l4l1l1l1l1l@l 57 CAT 58l@

l 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO CON'T 10111 3$"c' 60@l Ol61 5101 DOCK -l 0131 2 l S l@l il69 01 EVENT1l 0DATE l 8121@l 111 REPORT 11 l DATE 2l 8 l 2l@ 80 8 68 74 75 7 ET NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 lWhile performing ADS Valve Operability Test, PT-11.1.2, at 200 psia reactor pressure 1 o 3 lon 10-10-82, S/R7 valve 1B21-F013J, failed to reclose until 50-100 psig reactor pres- I f7TTlIsure. Performance of this PT on 10-13-82 revealed S/RV valves 1-B21-F013D and E l o s lwould not open at 200 psig reactor pressure. However, while performing this PT on l 0 e 110-14-82 S/RV F013E was manually opened, but responded slowly. In each case, the unit l l 0 l 7 l lwas then placed into cold shutdown. Neither event affected the health and safety of l l o is l Ithe public. Technical Specifications 4.5.2b, 6.9.1.9b l 80 7 8 9 C DE COOC SU8C DE COMPONENT CODE SU8 CODE SU E o 9 l Cl Jl@ l Elh l B lh lV l A lL lV l0 lP lh yh J h 9 10 12 13 18 19 20 7 8 11

, $EQUENTIAL OCCUR etE NCE REPORT REVISION EVENT YEAR qEPORT NO. CODE TYPE N O.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l o l [F013J failed to reclose because its solenoid valve failed to clo se. attributed to l..

i i la faulty spring within the solenoid valve. The defective solenoid valve was ren1ncad I

, , galong with the valve pilot assembly and F013J was tested satisfactorily. The problems l l

, 3 laffecting F013D and E have not yet been determined. Both valves were replaced in theitj j i 4 [ entirety and tested satisfactorily. l 7 8 9 80 3

S  % POWER OTH ER STATUS dis RY DISCOVERY DESCRIPTION NA lilsl { @ l0l0l4lgl l W@l Periodic Test

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'JT,vlTY CO# TENT AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 (Zj RELEASED @OF RELE ASE[Z_j@l NA l l 45 NA 80 l

7 8 9 10 11 44 PEHSONNEL E XPOSURES NUMBER TYPE DESCRIPTION NA l

[TTT1 10 10 10 l@W@l PERSONNE L INJURIES NuvsER DESCRiefiONh 7

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LOSS OF OR DAMAGE TO FACILITY Q TYPE DESCRIPTION  %/

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7 8 9 10 PUBL ICt TY 8211220259 821112 NRC USE ONLY

• ISSUED PDR ADf3CK 0"000325 l

l 2 I o l [N_j@ lDESCRIPTION S PDR I IIIIIIIIIIIIII 7 8 9 to 68 69 80 5 NAME OF PREPARER M. J. Pastva, Jr. PHONE: 919-457-9521 2

LER ATTACHMENT RO #1-82-108 l

l Facility: BSEP Unit No. 1 Event Date: October 10, 1982 While performing the ADS System Valve Operability Test, PT-11.1.2, during Unit No. I startup at a reactor pressure of 200 psig, S/RV 1B21-F013J failed to

reclose until reactor pressure was 50-100 psig. The reactor was then placed in cold shutdown. On October 13, 1982, while performing this PT, S/RV valves 1-B21-F013D and E failed to open at a reactor pressure of 200 psig. Following this event, the unit was again placed into cold shutdown.

An inspection of the F013J, Model No. 7567F, revealed the F013J solenoid valve open with noninterruptible instrument air still exhausting through the solenoid valve outlet port. When the solenoid valve air supply was isolated, J the solenoid valve closed. The F013J solenoid valve was then removed and bench tested satisfactorily. An investigation of this problem by an on-site representative of the valve vendor concluded the unusual valve operation was caused by a faulty spring within the solenoid valve. The valve vendor, Target Rock Corporation, acknowledges that solenoid valve spring relaxation is a design problem and consequently, they have developed a more reliable replacement spring. The design modification changed the material from the original 302SS to Inconel-718. This modification was completed for all solenoid valves in Unit No. 2 during this 1982 refueling outage. The 4

remaining Unit No. 1 solenoid valves will be modified during the 1982 refueling outage scheduled for November 27, 1982.

The problem solenoid valve on S/RV F013J was modified with the improved spring material. As a preventive measure, the valve pilot assembly was also replaced. During subsequent performance of PT-11.1.2 on October 13, 1982, F013J tested satisfactorily.

Following the discovery of problems affecting the opening capabilities of S/RV F013D and E, an inspection of both valves was performed. This inspection, which was conducted with the assistance of the valve vendor representative, was unsuccessful in determining what problems affected both valves. Both valves were replaced in their entirety and were tested satisfactorily. Also, the solenoid valves for these valves were modified with the improved spring material. Both failed valve units are presently being laboratory tested to determine the cause of their failures. Following a determination of the problems affecting F013D and E, a supplement outlining the cause and corrective action for each failure will be submitted.

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