ML20023E095

LER 83-027/03L-0:on 830505,one Header (42 Bottles) of Control Room Bottled Air Pressurized Sys Found to Have Lower than Required Pressure (2,290 Vs 2,300 Psig).Probably Caused by Leakage When Compressor malfunctioned.W/830601 Ltr

ML20023E095
Person / Time
Site:	North Anna
Issue date:	06/01/1983
From:	Harrell E VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-83-027-03L-01, LER-83-27-3L-1, N-83-071, N-83-71, NUDOCS 8306090158
Download: ML20023E095 (3)

Text

i U.S. NUCLEAR REGULATORY COMMISSION e LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1) (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

/D/1/ /V/A/N/A/S/1/ (2) /0/0/-/0/0/0/0/0/-/0/0/ (3) /4/1/1/1/1/ (4) /// (5)

LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

! /L/ (6) /0/5/0/0/0/3/3/8/ (7) /0/5/0/5/8/3/ (8) /0 /6 /0 /1/8 /3 / (9)

OR DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

/0/2/ / On May 5, 1983, with Unit 1 in Mode 1, one header (42 bottles) of the Control /

/0/3/ / Room Bottled Air Pressurized System was found to have a lower than required pres-/

/0/4/ / sure (2290 psig vs. 2300 psig). Since the Bottled Air System was restored to /

/0/5/ / operable status within the time limits of the Action Statement of T.S. 3.7.7.1, /

/0/6/ / the health and safety of the public were not af fected. This event is reportable /

/0/7/ / pursuant to T.S. 6.9.1.9.b. /

/0/8/ / /

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/ /S/G/ (11) /X/ (12) /Z/ (13) /Z/Z/Z/Z/Z/Z/ (14) /Z/ (15) /Z/ (16)

SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO. CODE TYPE NO.

(17) REPORT NUMBER /8/3/ /-/ /0/2/7/ //'/ /0/3/ /L/ /-/ /0/

ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

/X/ (18) /Z/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) /Y/ (23) /Y/ (24) /Z/ (25) /Z/9/9/9/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / It is suspected that leakage from the affected "A" header occurred when the comp-/

/1/1/ / pressor being used to pressurize the redundant "B" header malfunctioned. The /

/1/2/ / "A" header was inspected but the source could not be located. An available Unit /

/1/3/ / 2 header was valved in and the system was declared 1 .sble. /

/1/4/ / /

FACILITY METHOD OF STATUS  % POWER DISCOVERY DESCRIPTION (32)

/1/5/ /E/ (28) /1/0/0/ (29) / OTHERNA STATUS

/ ( 0) DISCOVERY

/A/ (31) / Operator Observation /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35) LOCATION OF RELEASE (36)

/1/6/ /Z/ (33) /Z/ (34) / NA / / NA /

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) /Z/ (38) / NA /

PERSONNEL INJURIES NUMBER DESCRIPTION (41)

/1/8/ /0/0/0/ (40) / NA /

LOSS TYPE OF OR DAMAGE TO FACILITY (

DESCRIPTION

/1/9/ /Z/ (42) / NA 8306090158 830601 PUBLICITY PDR ADOCK 05000338 ISSUED DESCRIPTION (45) S PDR ONLY l /2/0/ /N/ (44) / NA / ////////////

1 (703) 894-5151 NAME OF PREPARER E. Wayne Harrell PHONE AY

d a o

Virginia Electric and Power Company North Anna Power Station, Unit No. 1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 83-027/03L-0 Description of Event On May 5, 1983, with Unit 1 in Mode 1, one of the operable headers of the Control Room Bottled Air Pressurization System was found to have a lower than required pressure (2290 psig vs. 2300 psig or greater).

There are four pressurized bottled air headers available, 2 headers for each Unit and 42 bottles in each header. With either Unit in Mode 4 or above, two headers (84 bottles total) are required to be operable.

At the time of this event, one bottled air header on Unit I was not operable as it was being pressurized. Consequently one bottled air header on each unit was being utilized to satisfy the requirements of the Unit 1 Technical Specifications.

Probable Consequences of Occurrence Operability of the Control Room Bottled Air Pressurization System ensures that breathable air is available to maintain a positive interior pressure in the Control Room in the event the outside air is contaminated. Since the System was restored to full operability within the time limit of the Action Statement of T.S. 3.7.7.1, the health and safety of the public were not affected.

Cause of Event Prior to the event, the Unit 1 "A" header was in service with a pressure of 2350 psig recorded at 0400 on May 5 and the isolated Unit 1 "B" header was being pressured. The compressor being utilized malfunctioned at 0610 and its relief valve opened decreasing the "B" header pressure. The "A" header pressure was observed to be 2290 paig at 0800. It is suspected that leakage occurred when the compressor malfunctioned.

Immediate Corrective Action Upon discovery of the low pressure condition, the Unit 1 "A" header was isolated and the remaining available Unit 2 header was placed in service. The affected header was inspected, however no evidence of leu & age was found.

Scheduled Corrective Action No further corrective action is required.

Actions Taken to Prevent Recurrence No further action is required.

Generic Implications This was an isolated event; therefore there are no generic implications.

4 co PCO VIRGINI A ELECTRIC ANG POWER COMP ANY Q >C M

- CD NORTH ANN A POWER sT ATION { = 2[

P. O. BOX 402 27- E MINERAL, VIRGINI A 23117 @ .

93 C[

June 1, 1983 u= EsE5 33 2T r<> Eb_:

cd p-Mr. James P. O'Reilly, Regional Administrator Serial No. N-83-071 U. S. Nuclear Regulatory Commission N0/JRR: nih Region II Docket No. 50-338 101 Marietta Street, Suite 2900 Atlanta, Georgia 30303 License No. NPF-4

Dear Mr. O'Reilly:

Pursuant to North Anna Power Station Technical Specifications, the Virginia Electric and Power Company hereby submits the following License Event Report applicable to North Anna Unit No. 1.

Report No. Applicable Technical Specifications LER 83-027/03L-0 T.S. 6.9.1.9.b This report has been reviewed by the Station Nuclear Safety and Operating Committee and will be forwarded to Safety Eval nation and Control for their review.

Very Truly Yours, E. Wayne Harrell Station Manager Enclosures (3 copies) cc: Document Control Desk (1 coty) 016 Phillips Bldg.

U.S. Nuclear Regulatory Commission Washington, D. C. 20555

.n OFTic1ki.OVi -

%-M C i/>