ML19095A806

Submit Abnormal Occurrence Report No. AO-S1-75-16

ML19095A806
Person / Time
Site:	Surry
Issue date:	09/05/1975
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/RGN-II
References
Serial :tiro. 677 LER 1975-016
Download: ML19095A806 (3)

Text

1**

I VIRGINIA ELECTRIC AND POWER COMPA RIOHMOND, VIRGINIA. 23261 September 5, 1975 fil~ Cy.

Mr. Norman C. Moseley, Director Serial :tiro. 677 Office of Inspection and Enforcement PO&M/JTB:clw United States Nuclear Regulatory Commission Region II - Suite 818 Docket Nos. 50-280 230 Peachtree Street, Northwest License Nos. DPR-32' Atlanta, Georgia 30303

Dear Mr. Moseley:

Pursuant to Surry Power Station Technical Specification.6.6.B.1, the Virginia Electric and Power Company hereby submits forty (40) copies of Abnormal Occurrence Report No. Ao..:sh75-16.

The substance of this report has been reviewed by the Station Nuclear Safety and Operating Connnittee and will be placed on the agenda for the next meeting of the System Nuclear Safety and Operating Committee.

Very truly yours,

'ti% ))';, ~f:!-t;.(*~y0 C. M. Stallings Vice President-Power Supply and Production Operations Enclosures 40 copies of Ao..:sl-75-16 cc: Mr. K. R. Goller OOCKITTD USNRC

.\_.ho .

SEP161975.~

...

• LICENSEE EVENT REPOptt

,* .c'l.O-Sl-75-16 CONTROL Bl.pCK: I I I I I I 1 [PLl.:.ltSE PP.!NT ALL REQUl~ED 11\!FORMA"CION]

1 6 LICENSEE EVENT NAME LICENSE N'_!~.~:=,:;;:: TYPE

@IT} I VI Al s Ip I s I 1 I I150 1°1-1°1°1°1°1°1-1° 1°25I ~111110J 26 30 I OI 1 I 7 8 9 14 31 32 REPORT REPORT CATEGORY TYPE. SOURCE DOCKET NU~l,3,ER EV~{:i .::.,!.. CT . REPORT DATE

@EJ CDN'T IP IO j L!J ~ 10 j s Io J- l o !2 J s JoI I oJ sl 212 17151 jOJ9j9j2!7j5 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION

@:Tu] LDuring normal operation on August 22, 1975, it was noted that Channel II 6T/Tavg J 7 B 9 BO

@El !protection had drifted in the nonconservative direction viol2.ti"2.g Technical Specif- I 7 B 9 80

@El lication 2.3. The channel was placed in. the trip mode . .~ incor~ect resistance of I

7 8 9 80

['§Tsl jthe hot leg resistance temperature detector (RTD) caused tb2 :instrunent drift. A l

7 8 9 80

@))] !failure of the RTD wa~ assumed and the installed spare RTD ~2s placed into (can't) _J 7 8 9 P?.i'.'-E: 80 SYSTEM CAUSE C0!. 1.;:0.','SNT COMPONENT CODE CODE COMPONENT CODE SU??-13ii MANUFACTU;::E?

7

@El 8 9 hl.AJ 10 LLl 11 IV I A IL IV I 12 EjX 17 I ~

43 lxl91919 44 47 wL3 CAUSE DESCRIPTION

@ill jDuring the subsequent investigation a reactor coolant leak x.ste indicated an approxi- J 7 8 9 80

@El jmate 2.5 gpm primary.leak. The unit was brought to hot sht: td.or..;n. Further investiga- j 7 8 9 BO

[2J_g I tion revealed that the RTD was being sprayed with stea:n ~P-1... ateT from a packing. (cont~

7 8 9 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DlSCOVERY EID 7 8 g bu 10 Lo !9 Is I 12 13 IN/A 44 w45 46 N/A

.-::----------------J BO FORM OF ACTIVIYY. CONTENT OF RELEASE AMOUNT OF ACTIVITY rn RELEASED 7 8 9 L~ wl 10 11 N/A 44 45 N/A 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 7

ITel[ololoJ 8 9 11 w12 I

13 N/A 80 PERSONNEL INJURIES NUrABER DESCRIPTION

~ L9_J_.cl_gj N/A 7 8 9 11 12 80

. OFFSITE CONSEQUENCES 7

Ffy8 l_B~/A_*~~~~~~~~~~~~~~~~~~~~~~~-~~~~~__J 9 BO LOSS OR DAMAGE TD FACILITY TYPE DESCRIPTION 7

fils1B 9uJ .10 IN/A_ _ _ __

80 PUBLICITY 7ITB89LJ~/A .~-------~-----"----------~--------'--------------8~0 ADDITIONti.L FACTORS

~ j The healt~1 and safety of the general public was not in any .r,.;ay affected.

7 BS *-------~ 80 80

.I NAME:

E. M. Sweeney~ Jr. PH'.)N::: (SOI;) 357-3184 Gro a B1

• 6 6 7

_J

EVENT DESCRIPTION (con't) service. The channel was successfully tested and returned to service. Dur;ng normal operation on August 23, 1975, Channel II 6T/T protection driited 2gain in the nonconservative direction. The unit was rampidgdown until the chailllel was placed in the trip mode. An incorrect resistance of the installed spare hot leg RTD in use at the time caused the instrument drift. (AO-Sl-75-16)

CAUSE DESCRIPTION (con't) leak on valve l-RC-55 causing incorrect oh3ic characteristics. The 2 inch 7alve was manufactured by Rockwell-Edwards Hamifacturing Company. The packing *,.;as replaced and the RTD ohmic characteristics returned to normal after the KTD dried.

Since the drift was caused by moisture on the normal RTD rather than a :f2ilure as originally assumed, the normal RTD was reconnected and the cha2.nel successfully tested and returned to service.

__J