05000280/LER-1980-062-03, /03L-0:on 801019,w/unit at Cold Shutdown & Defueled,Pt 26.1 Showed RM-CC-105/106 Alarm Setpoint to Be Greater than Twice Background Radiation Levels.Caused by Decrease in Background Radiation Levels.Setpoints Reduced

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/03L-0:on 801019,w/unit at Cold Shutdown & Defueled,Pt 26.1 Showed RM-CC-105/106 Alarm Setpoint to Be Greater than Twice Background Radiation Levels.Caused by Decrease in Background Radiation Levels.Setpoints Reduced
ML18139A847
Person / Time
Site: Surry 
Issue date: 11/17/1980
From:
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A844 List:
References
LER-80-062-03L-02, LER-80-62-3L-2, NUDOCS 8011210550
Download: ML18139A847 (2)
v • d • e


LER-1980-062, /03L-0:on 801019,w/unit at Cold Shutdown & Defueled,Pt 26.1 Showed RM-CC-105/106 Alarm Setpoint to Be Greater than Twice Background Radiation Levels.Caused by Decrease in Background Radiation Levels.Setpoints Reduced
Event date:
Report date:
2801980062R03 - NRC Website
v • d • e

text

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RC FORM 366

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=~~~~! W© I o I s I o I a I a '2 1 s lo K!)h 60 61 DOCKET NUMBER 68 69 EVENT DESCRIPTION *AND PROBABLE CONSEQUENCES @

DI) I With Unit 1 at cold shutdown and defueled. Pr 26, 1 showed H:HX:-J 05,

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p:,ints to be greater than. twice backgrotmd~ This reduces:;-the sensit:i.vity;tq_transiertt~ J This is contrary *to Tech. s~. Table 3, 7-5,.0~iid-is reE9rtable as per T.S. 6.6.2.b. I.

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40 41 42 43 I VI *l 11 I 5 I CAUSE DESCRIPTION AND CORRECTIVE ACTIONS@

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I With Unit 1 srutdown and defuelerl, background radiation decreaserl as shown by PI'-26. l

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rn I Both RM-CC-105 am. :Ef.1-CC-106 setp;:,ints were reset to a ~m-* less :.tban twice rackg;rauna I
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A'ITACHMENI' 1 SURRY roWER SI'ATION, UNIT 1 r::o:KEI' NO:

50-280 REroRI' NO:

ao=o62/03L-o EVENT DATE: 10-19-80 TITLE of EVENl':

RM-<::c-105/106 SErromrs out of SPEC.

1.

DES::lUPI'ION of EVEm':

With Unit 1 at cold slut.down and defueled, PT 26.* 1 sho\\oJed :EM-CC-105/106 alann setp:>ints to be greater than twice background.

This is contra:ry to Te:h *. Spec.

Table 3.7-5 and is rei:ortable as per T.S. 6.6.2.b.(l).

2.

PROBABLE COO'SEQJENCES and SI'ATUS of REDUNDANI' SYSI'EMS:

Ccxnp=>nent cooling water i:adiation nonitors (RM-CC-105/106) provide for the.

automatic closure of CC surge tank vent valve HCV-CC,;,..100.

With the reduce::l.

background :radiation resulting :from Unit 1 defueling, the seti:oint 9f :EM-CC-

  • 105/106 Imlst be lowere::J.. *.The.setp:,ints being less *conservative. than those ** ***.: * *..

required by T. s.: does not prevent tfle.fulfillmerit of the functional requiranents.

of this system.

Therefore the health and safety of b.'<ie.p.lblic were not. - ',*

affe:ted.

.. 3.

CAUSE

    • This event was due to tii~* de:rease. in background :radiatio~: levels.
- 4.

IMMEDIATE CORRECI'IVE ACTION:

Re::l.uce the alann setp:,ints to less than twice background by use of proce::l.ure CAL-RM-004..

5. SUB~ CORRECI'IVE ACTION*:

None requirerl.

6.

ACTIONS TA.T<Et-1 to PREVENl' REOJRRENCE :

None.

7.

GENERIC IMPLICATIONS:

None.

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