05000280/LER-2075-020, Re Power C Generator Pressure Indication-496-Channel IV Failed High

Re Power C Generator Pressure Indication-496-Channel IV Failed High

ML19105A195
Person / Time
Site:	Surry
Issue date:	01/15/1976
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/RGN-II
References
Serial No. 840 LER 1975-020-00
Download: ML19105A195 (3)

LER-2075-020, Re Power C Generator Pressure Indication-496-Channel IV Failed High

Event date:
Report date:
2802075020R00 - NRC Website

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e Mr. _Norman C. Moseley, Office of Inspection and Enforcement--... __ _..,....

United States Nuclear Regulatory Commission Region II - Suite.818 230 Peachtree Street, Northwest Atlanta, Georgia 30303 Docket No. 50-281 License No. DPR-37

Dear Mr. Moseley:

Pursuant to Surry Power Station Technical Specification 6.6.B.l, the Virginia Electric and Power. Company hereby submits forty (40) copies of Abnormal Occurrence Report No. AO-S2-75~20.

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

Enclosures 40 copies of AO-S2-75-20 cc:

Mr. Robert W. Reid Very truly yours,

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C. M. Stallings Vice President-Power Supply and Production Operations 1... -~

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8 9 14 CATEGORY REPORT TYPE UCEr-,S~ !'*JL1~,.'.~E=?

I o I o 1=--1 o I o I o I o I o 1-Jo I o I 15 25 REPORT SOURCE DOCKET NUM3ER i.;-- ~*., c..;:

[411!111! 11 26 30 EVENT DATE lVf:i\\.tT

-YPE I o ! 1 J 31 32 REPORT DATE

@illcoN'T I PI o I l!J ~ I O I 5 I O_I -

IO I 2 I 8 I 1 I 11!2!11917151 o I l I o I z I 7 I ~J 7

8 57 58 59 60 61 68 69 74 75 80

EVENT DESCRIPTION

[Qlg] !During normal operation 7

8 9 of Unit No. 2 at 100 per cent power "C steam generator pres-J This is a violation of section 3.7 of

@EJ I sure indication-L196-Channel IV failed high.

7 8 9

@El I.Technical Specifications.

An immediate ra:npdmvn of 150 MWe per hour was initiated 7

89

~ Ian instrument technician*was dispatched to place the channel in the trip mode.

7 8 9 ffil§] I (AO-S2-7 5-20) 7 8 9 SYSTEM CODE

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CAUSE

CODE COMPONENT CODE Lci IP Ir !Pl E) xj xj 7

8 9 10 11 12 17 CAUSE DESCRIPTION PRIME COMPlJNE"JT SUP;:>UER

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43 COMPONENT MANUFACTUREi1 121919191 44 47 VIOLATION

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48

.@:.@] [_Examination of the failed transmitter revealed the sensing line to be frozen.

This 7

8 9 80 the I fJO and J 80 J

80 80

_J 80

@:§] I condition was caused by abnormally cold outside air being drawn through a set of in-

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7 8 9 ITJ§] I take louver_s (located adjacent to the sensing line i.n the safeguards building (con' t) 8!

7 8 9 80 FACILITY METHOD 0~.

STATUS

% POWER OTHER STft.TUS DISCOVERY DISCOVERY DESCRIPTION EE]

~J I l I I I 01 Oj N/A w

N/A 7

8 9

10 12 13 44 45 46 80 FORM OF ACTIViTY CONTEIH rn RELEASED OF RELEft.SE AMOUi>JT OF ACTIVITY Lu wl N/A J

LN/A LOCATION OF RELEA.SE

_J 7

8 9

10 11 44 45 80 PERSmJNEL EXPOSURES NUMBER TYPE

DESCRIPTION

llEl !U2._L2..1 ~ L N/A 7

8 8 1*1 12 13 00 PERSONNEL INJURIES NUMBER

DESCRIPTION

EE] l__oj oj ~I L N/A 7

8 9 11 12;------------------*--------------------

_J 80 OFFSITE CONSEGlUENCES lilil L N/A

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*_J 7

8 9 80 LOSS OR DAMAGE TO FACILITY TYPE

DESCRIPTION

~l~ I N/A

_______ _J 7

8 9 10 80 PUBLICITY (i0 l N/A 7

8 8 80 ADDITIONAL FACTORS li[~J jThe probability of a similar failure of another transmitter has been eliminated by J

7 8 9

!30

~ J sealing the_ intake lom~and,;,,~ill be furt~:r remov_ed by the installation_ (con' t) _ 8j N/.\\1\\/iE: __ ~_:___2;,* Baucom (80L1) 357--3 lc:-4

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e CAUSE DESCRIPTION (can't) wall) and over the sensing line.

The louvers were closed and sealed allowing the line to thaw and the transmitter to be returned to normal service.

ADDITIONAL FACTORS (can't) of heat tracing on the sensing lines which are located adjacent to the ventilation louvers.

The ability of the safety injection system to perform its function was in no *way impaired by this failure.

Although the transmitter failed in the nonconservative direction (drifted high) it was only in this condition for a brief period of ti.T11e before it was placed in the trip mode.

In addition the other t,rn rewaining channels were in proper working order and could have provided a safety injection signal, if required, since only two out of three channels are required to initiate a safety injection.

The health and saf.ety of the general public was in no way endangered since the safety injection system was able to perform its intended function at all times during this occurrence~

This is a similar occurrence to that noted on Unit No. 1 on December 19, 1975.