ML19345G092

RO 76-10:on 760801,during Monthly Surveillance Test of Refueling Bldg Containment Sys,Test Pressure Requirements Could Not Be Met.Caused by Inoperable Refueling Bldg Controller Due to Previous Pressure Transient

ML19345G092
Person / Time
Site:	Humboldt Bay
Issue date:	08/21/1976
From:	Rapp W PACIFIC GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
RO-76-10, NUDOCS 8103020191
Download: ML19345G092 (2)

Text

CONTROL 8 LOCK:l

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.l l

l l'

(PLE PRINT ALL REOUIRE] INFORM 2 TION) 4, 1

6

' ME LCEN$l NUMBE3 y E 17 lc l A l H l Ml,Bl 1l l0l0l-l0l0 l0 l0 l0 l-l 0 l 0 l l 4l 1 l1l1l1l l0 l3 l 0

7 89 14 15 a!5 26 30 31 32 TN NN CAftGOAY DOCKET NUMBEA EVENT DATE REPOAT DAT[

0 COWT l P l 0 l W d l0 !S l 3 l-l0 l1l 3l 3l l0 l8 l0 l1 l 7 l 6 l l0 l8 l2 l1 l7 l6 l 7 3 57 b8 59 60 61 68 69 74 75 80 EVENT DESCRWTION BE l During the performance of the routine monthly surveillance test of the refueling l

7 89 80 Q l building containment system, the presaure requirements of the test cculd not be met.

l 7 89 80 EE l Ris is not a repetitive occurrence. He building differential pressure controller l

7 89 80 gg l was refilled with oil and a satisfactory test conducted (LER 76-10).

l 7 89 80 hl l

7 89 80 mg SYSTEM CAUSE Coup 0NENT COMpONFNT CODE CODE COMPONENT CODE SUCRER LA W ACTURA VOLATON BEIsial W l11 N I s1 Tl Riu l W

lxl3l4l0l 0

7 89 10 11 12 17 43 44 47 48

';AUSE DESCAIPTION Q l Upon investigation, the refueling building pressure controller was found to be inoper-l 7 89 80 3l l able, probably due to a pressure transient th at occurred during earlier st ages of the l 7 69 80 DE Itest. The main control valve has exhibited sluggish operation in the past and (cont). l FACUtv METH00 0F STATUS

% POWE A oTHER STATUS DrSCOVE RY OfSCOVE RY DESCR@ TON d

!0l0l0l l NA l

[B}

l NA l

1 7 8 9

10 12 13 44 45 46 80 LE SED 0 L ASE AMOUNT OF ACTMTV C*ATON OF AELEASE

]6 W

Wl NA l

l NA l

7 8 9

10 11 44 45 80 PERSONNEL EXPOSURES NUMBEA TYPE DESCA@ TON GE 10 lo lo I LzJ l

NA l

7 89 11 12 13 80 i

PERSONNEL INJUA;ES NoveER DESCA@ ION

]l l 0l0 l 0 l l NA l

7 89 11 12 80 OFFSITE CONSEQUENCES DE l No probable consecuences since no operations that could damage fuel were conducted l

[7 8 9 until af ter the successful completion of the surveillance test.

80 LOSS 04 OAMAGE TO FACluTY TYPE DESCR@ TON D] d l NA l

7 89 10 80 PUBLCITY gg l NA l

7 89 80 l

ADDITONAL FACTORS DE l Re unit was in the cold shutdown mode prior to the test and remained there until the l 7 89 80 Q l completion of the successful subsequent test.

l I

7 89 80 NAME:

W. T. Rapp PHONE (707) 443-2787

1. 7o86"?

P00R ORIGINC

(

CAUSE DESCRIPTION (cont) may have contributed to the problem. A new valve is on order and will be installed as soon as possible.

Following the valve replacement, the control system will be evaluated to determine if modifications are required to prevent recurrence of this problem.

6 9

0 P00R ORIGINAL u