ML20070J868

RO 76-13:on 760916,normal Boric Acid Makeup to Vol Control Tank Could Not Be Accomplished Due to Plugging of Chemical & Vol Control Sys Line 1-inch-CH-56-152.Cause Unknown.Line Will Be Inspected for Indications of Solidification

ML20070J868
Person / Time
Site:	Surry, 05000000
Issue date:	10/20/1976
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20070J834	List: L-75-304, Responds to NRC Re Deviation Noted in IE Insp Repts 50-250/75-07 & 50-251/75-07.Corrective Actions:Fire Stops Installed in Cable Trays in Unit 4 Control Rod Drive Room & Entrance to Auxiliary Bldg Above Main Corridor Doors L-75-354, Responds to NRC Re Violation Noted in IE Insp Repts 50-250/75-08 & 50-251/75-08.Corrective Actions: Superseded Procedures for Surveillance Testing Removed & Latest Revision Placed in Control Room on 750526 L-75-595, Responds to NRC Re Violation Noted in IE Insp Repts 50-250/75-16 & 50-251/75-16.Corrective Actions:Overdue Inservice Insp Rept Transmitted to NRC on 751120 & Procedure Written to Describe Scheduling & Preparation of Repts ML20070J858 ML20070J868 ML20070J880 ML20070J896 ML20070J983 ML20070J985 ML20070K041 NG-75-2264, Responds to NRC Re Violations Noted in IE Insp Rept 50-261/75-14.Corrective Actions:Quarterly Calibr of Survey Instruments Will Be Performed Per Health Physics Procedure HP-11 by 760131 & Procedure HP-1 Will Be Revised
References
FOIA-82-534 292, RO-76-13, NUDOCS 8212290075
Download: ML20070J868 (5)

Text

VIRGINIA EI.ECTRIC AND Pow.. CO31PANY Ric113t OND.VI Ro r x1 A C3GC1 October 20, 1976 Mr. Norman C. Moseley, Director Serial No. 292 Office of Inspection and Enforcement P0&M/ALH:clw U.S. Nuclear Regulatory Cocsission Region II - Suite 818 Docket Fo. 50-280 230 Peachtree Street, Northwest License No. DPR-32 Atlanta, Georgia 30303

Dear Mr. Moseley:

Pursuant to Surry Power Station Technical Specification 6.6.B.2, the Virginia Electric and Power Company hereby submits a copy of Licensee Event Report USRE-SI-76-13.

The substance of this report has been reviewed by the Station Nuclear Safety and Operating Co=:nittee and will be placed on the agenda for the next meeting of the System Nuclear Safety and Operating Co=mittee.

Very truly yours, C. M. Stallings

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Vice President-Power upply

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and Production Operations Enclosure cc:

Mr. Robert W. Reid, Chief Operating Reactors Branch 4 (40 copies USRE-S1-76-13) l l

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/6 8212290075 821130 7

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PDR FOIA SCHLIsss2-534 PDR l

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,1 CATEGORY pf N E 00CxET NUMBER 01 CGN'T l p l ol M l 0l 5l 0l-l 0l 2l 8l 0 l l 0l 9l Il 6l 7l 6l

[ t l 0 l 1l 5ll EVENT DATE REPORT DAK 7 8 57 58 59 60 61 68 69 -

74 75 EVENT DESCRIPTION lDuring normal operations, it was discovered that normal boric acid cakeup to the vs o2 7,8 9 l control tank could not be accomplished due to an apparent plugging of CVCS line 1"c 03 7 89

@ ]56-152.

In order to clear the line, recirculation between the boric acid tanks anj 7 8

@9l boron injection tank was secured for five (5) minutes to permit installation of a 7 89 RE l blank flange in the line.

Since Technical Specification 3.2.C.6 requires con- (cos 7 89 coy

$oE COMPONENT CODE

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VoLAToM 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION l Boric acid is transferred through line 1"-CH-56-152 on a regular basis for volume G 0

7 89 ltroltankmake-up.

This routine usage, coupled with the fact that no malfunctionia 09 7 89

' 10 l heat tracing was found either in the pipe in question or any upctream pipe (con't) 7 89 FACUTY METHOD OF STATUS

% POWEA OTHER STATUS OtSCOVERY I

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l' N/A OtSCoVERY CESCRIPTON 1

7 8 9

10 12 13 44 45 48 ACTMTV CCATENT RELEASED OF RELEASE l N/A l

l N/A AMOUNT OF ACTMTY 12 l_z_,l l,z,j LOCATCN OF RELEASE 7 8 9

10 11 44 45 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q l0l0l0l Wl N/A 7 89 11 12 13 PERSONNEL INJURIES NUMBER CESCRtPTON

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N/A 7 89 11 12 OFFSITE CONSEQUENCES DE l N/A 7 89 LOSS OR DAMAGE TO FAC1UTY TYPE

@ W lDESCPSTON N/A 7 89 10 PUBUCITY Ql N/A 7 89 ADQtTIONAL FACTORS l Since the capabilities of the safety injection system were not 18 impaired by this eveg 7 89 Q l the health and safety of the general public were not affected.

7 89 NAME:

Tyndall L. Baucon PHONE, (804) 337-3184 p

EVENT DESCRI~ ' ION (c::n't) tinuous recirculation, an immediate reactor rampdown was initiated until boron injection tank recirculation was returned to normal.

Once the line was cleared of the obstruction, boron recirculation was again secured while the blank flangG was removed. A reactor rampdown was performed during this operation which lastG for approximately three (3) minutes.

(USRE-S1-76-13)

CAUSE DESCRIPTION (con't) leaves the cause of the obstruction as an unknown factor. The line was inspectG for potential " cold" spots which could cause isolated solidification of boric acid, but none were found in the area of the obstruction.

The line will be in-spected for indications of solidification during the next refueling shutdown.

During the period of obstruction, the capability to add boric acid to the reactor coolant system was maintained.

In addition, the boron injection tank was capable of performing its intended function.

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1 Vircinia Electric and Pover Co.mpany Eochet No.

50-280 Surry Unit 1 License No.

DPR-32 REPORTABLE OCCURRENCE REPORT 30:

Ro-280/76-07 DISTRIBUTION:

Don Lanham, ADM cc With Fnclosures Region II Docket Files 280 Rettion II Inspector with enclosures i

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