ML18113A947

LER 79-005/03L-0 on 790226:radiation Recorder RR-175 Stopped Printing.Caused by Gummed Gear Shaft Bushing in Print Mechanism.Bushing Was Freed & Print Mechanism Cleaned & Lubricated

ML18113A947
Person / Time
Site:	Surry
Issue date:	03/19/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18113A946	List: ML18113A945 ML18113A947
References
LER-79-005-03L, LER-79-5-3L, NUDOCS 7903230145
Download: ML18113A947 (2)

Text

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (1-1n. ~--

elCENSEE EVENT REPORT CONTROL BLOCK: 1..._,_ _.__-.1._ _,___ _.____.__~l CD (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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l During steady full power operation, radiation recorder,RR-175, stopped printing. This

~ I is con*trary to Tech *. Specs. 3.11.A.5 & 3.11.B.4;, and is reportable pursuant to

~-

~ Technical Specification 6.6.b.2(b). The monitoring instruments, including alarm and 1

~ I trip functions renained operable and releases were well within allowable limits.

[QJ]J ! Therefore, the health and safety of the public were not affected. Reference Report No.

~ l 78~045/03L-0, same docket, for similar event.

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7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUIBCODE

~8 7 9 IB I Al@ Lu@ lLl@ I I IN I sl Tl RI u I@

10 Tl 12 13 18 W w@

19 20 SEQUENTIAL OCCURRENCE REPORT REVISION

~ LER/RO LVENTYEAR . REPORT NO. CODE TYPE NO.

\:_:.,/ REPORT NUMBER j _

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41 LRJ ~@) Iv 11 11 15 I 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

I The failure of this radiation recorder to print was due to a gummed gear shaft bushing ITII] I in the print mechanism. The gummed gec1r shaft bushing was freed, and the print ITTIJ.L_mechanism __________________________________

was cleaned and lubricated. -,--______.

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7 8 9 BO FACILITY METHOD OF (:;;;..

STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION ~

DE W@ 11 1° 1° 11 8 9 10 12 ...

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7 45 46 80 ACTIVITY CONTENT ~

RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE @

C£TIJ u_j@ u.J@I 7 8 9 10 11 NA NA 44 45 80 PERSONNEL EXPOSURES Q\

NUMBER r::;:;,. TYPE DESCRIPTION

~ Io I o I OJe~@L--_ _N_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ ,

7 B 9 11 12 13 80 PERSONNEL INJURIES Q NUMBER DESCRIPTION6

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7 B 9 1010101@ 11 1 NA

.... 2 - - - - - - - - - - - - - - - - - ~ - - - - - - - - - - - - - - - - - - - - - - - - - ' 8 0 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION

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~W@ . NA 7 8 9 10 80 PUBLICITY Q ISSUEDQ DESCRIPTION~ ?903 NRC USE ONLY .,

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• ~ ~f,!=tachment, page l of 1)

Surry Power Station, Unit Docket No: 50-280 Report No: 79-005/031-0 Event Date: 2-26-79 Title of Report: Radiation Monitor Recorder (RR-175) Malfunction

1. Description of Event:

During steady power operation, it was discovered that radiation recorder, RR-175, had stopped printing. This is contrary to Technical Specification 3.11.A.5 for Liquid Wast*e

• disposal; 3.11.B.4 for Gaseous & Particulate waste for Process Vent Monitors. This is reportable per Technical Specifications 6.6.b.2(b).

2. Probable Consequences and Status of Redundant Systems:

A radiation recorder receives signals from various radiation monitoring devices and periodically records the corresponding radiation levels to indicate trending. The failure of RR-175 precludes the ability to automatically trend the radiation levels of those _devices associated with this recorder. However, the radiation indicator and monitors concerned here were in no way affected*by the recorder failure, they continued to function properly with all alarms operable; therefore, the health and safety of the general public were not affected. Accountability for radioactivity releases is maintained by other methods and was well within allowable limits for the period involved.

3. Cause:

Radiation recorder, RR-175, ceased functioning due to the seizure of a gear shaft bushing in the print mechanism.

4. Immediate Corrective Action:

A work order was immediately issued to correct the problem. While the recorder was inoperative, close attention continued to be given to the individual monitors and annunciators to detect trends.

5. Subsequent Corrective Action:

The seized gear shaft bushing was freed, and the print mechanism was thoroughly cleaned and lubricated.

6. Actions Taken to Prevent Recurrence:

The other radiation monitor recorders are being checked to assure that this problem is not present.

7. Generic Implications:

This event seems to be a random mechanical failure with, consequently, no generic implications.