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 L 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 (1-1n. ~--U.S. NUCLEAR REGULATORY COMMISSION

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

[iliJ I v I A I s I P I s I 1 I 0L..::I o--'-"I 0---'1"--*

-__.l_o _.l_o-'-1

...;_o _._I o"---Llo'---LI

_-_._I -=-o _,.__I ~o 101 4 I 1 I 1 I 1 I 1 101 I I 7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T I O I 1 I 7 8

~@Io I s Io Io I o 12 1 s I o 1010 I z I z I 6 17 60 61 DOCKET NUMBER 68 69 EVENT DATE I 9 10 I O I 3 1 1 1 9 1 7 I 9 I G) 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

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 ~-1 Technical Specification 6.6.b.2(b).

The monitoring instruments, including alarm and 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. [Q]]] 7 8 9 7 8 SYSTEM CODE IB I Al@ 9 10 LER/RO LVENTYEAR

\:_:.,/ REPORT j 7 I 9 j NUMBER 21_ 22 CAUSE CAUSE CODE SUBCODE COMPONENT CODE Lu@ lLl@ I I IN I sl Tl RI u I@ Tl 12 13 18 SEQUENTIAL OCCURRENCE . REPORT NO. CODE 1°1°1 5 1 1/1 I 0 131 23 24 26' 27 28 29 COMP. SUBCODE W 19 REPORT TYPE 30 VALVE SUIBCODE w@ 20 31 ACTION FUTURE* TAKEN ACTION EFFECT SHUTDOWN r:;:;,. ATTACHMENT NPRD-4 FORM ~UB. PRIMEC:.OMP.

SUPPLIER REVISION NO. LQJ 32 COMPONENT MANUFACTURER 80 ON PLANT METHOD HOURS SUBMITTED

~@~@ ~@ ~ 1°1°1°1°1 l~@ 33 34 35 36 37 40 41 LRJ ~@) Iv 1 1 1 1 1 5 I CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @ 42 43 44 47 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 mechanism was cleaned and lubricated.

ITTIJ.L_ __________________________________

-,--___ ___. [I]]] OE] 7 8 9 FACILITY STATUS % POWER OTHER STATUS NA DE W@ 11 1° 1° 11 8 9 10 12 ... 11 ___________

44 ACTIVITY CONTENT 7 RELEASED OF RELEASE AMOUNT OF ACTIVITY C£TIJ u_j@ u.J@I NA 7 8 9 10 11 PERSONNEL EXPOSURES Q\ 44 BO METHOD OF (:;;;.. DISCOVERY DISCOVERY DESCRIPTION ~@ ... I ___ o_p_e_r_a_t_o_r_o_b_s_e_r_v_a_t_i_o_n

________ __. 45 46 80 LOCATION OF RELEASE @ NA 45 80 NUMBER r::;:;,. TYPE DESCRIPTION Io I o I OJe~@L--__ N_A ______________________

_, B 9 11 12 13 PERSONNEL INJURIES Q NUMBER DESCRIPTION6 1010101@ 7 B 9 11 .... 12-----------------~-------------------------'80 LOSS OF OR DAMAGE TO FACILITY '4J\ TYPE DESCRIPTION ~W@ . 7 80 NA NA 7 8 9 10 80 PUBLICITY Q ISSUEDQ DESCRIPTION~

?903 NRC USE ONLY ., [IliJ NA '"' .23 o ( <{ S' l I I I I I I I I I I I I a 91 ~o-------------------------------------.168 69 80 ,;: 0

• ~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. 2. 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).

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.