ML19319C988

RO 77-74E:on 770719,unmonitored Reactor Bldg Purge Caused Radioactive Release Exceeding ETS & STS Limits.Caused by Procedural Inadequacy.Operational Procedure OP-147 Revised, Ensuring Radiation Monitor Rm-A1 Operability

ML19319C988
Person / Time
Site:	Crystal River
Issue date:	07/26/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19319C985	List: ML19319C984 ML19319C988
References
NUDOCS 8003040918
Download: ML19319C988 (2)

Text

LILCINO CC CV CIN I MCPUMi

.!o " . . .

CONTROL BLOCA.,

l 'l l l l l [PLEASC PRINT ALL RE%UtRED tr#0RMAT:C;'

1 S LCENSEE

• LCENSE EVENT NAME LCENSE NUMEER , TYPE TYPE

,, l FlL l ClR lP l3 l l0 l0 l-l0 l 0 l 0 l 0 l 0 l-l 0 l 0 l l 4 l 1 l1 l1 l 1l l0 l4 l 7 89 14 15 25 26 30 31 32 CATEcoRY f 5 coCx(T NUMBER ~ EVENT oATE REPORT oATE O 1 CON'T l - l -l lTl lLl l0l5l0l-l0 l1 ln l2 l l0 l7 l1 l9 l 7l 7l l 0 l 7 l2 l6 l7 l7 7 8 57 58 59 60 61 68 69 74 75 E EVENT DESCRIPTION g lIn mode 1 operation, the Reactor Building was purged for 22 minutes unmonitored causing 7 89 E:

03 l a radioactive release to the atmosphere exceeding 100 pei/sec contrary to E.T.S. 2.4.2.G 7 8D .

• S 04 l and K, 5.6.2. A and S.T.S. 3. 3.2.1, Table 3. 3-4. Redundancy NA. This event was non-7 89 E Mp l repetitive. Upon discovery the purge was ceased immediately, Reactor Building operating 7 oo , e Ots l procedure OP-417 has been revised to ensure the operability of the R.B. purge monitor 7 89 Paut (LER 77-74E) E <

SYSTEM CAUSE COMPONENT COMPONENT coot coot couPcNeNT cooE suP5MR MANUFACTURER VOLATON

$ .lSlBl ({J 7 89 10 l Zl Zl Zl Zl Zl Zl lZl lZl9 l9[9l47 lYl ,

11 12 17 43 44 48 '

CAUSE DESCRIPTION '*

. / J, s l The Reactor Building operating procedure OP-417 did not' insure the operability of the R.B.

7 89 Et 09 l purge radiation monitor Rm-A1.

Op-417 har been revised to ensure operability of RM-Al be-7 89 S:

] l fore purging.

FAC UrY UETHoo oF ,

Status  % POWER oTHEA STATUS LSCoVERY otSCoVERY oESCRi?TCN 1 lE l l0 l8 l8 l l NA l lA l l NA 78 9 10 12 13 44 45 46 BC

1. A [r"i nN ccMTENT .

RE'.EASto AMOUNT OF ACTMTV LoCATCN OF RELEASE 12 y oFW RELEASE l .739 curiesgas noble l l Reactor Bldst. vent to atmosehere 7 8 9 10 11 44 45 8; PERSONNEL EXPOSURES NUMBER TYPE CESCRIPTCN 13 l 0l 0l 0l lZ l l NA 7 89 11 12 13 Er PERSCNNEL INJUAIES NUMSER DESCRIPTON NE l 0l 0l 0l l NA 7 89 11 .12 ,

6C NA -

h 7 89 lOFFSITE CONSECUENCES -

80 l

i LOSS OR OAMAGE TO FACILITY TYPE oESCRPTON .

7 1

89

@ l to NA LL l PUBUC!TY

]l 7 89 NA UC

[]l l RM-Al before purging the Reactor Building.

Y8ADDITIONAL FACTOAS

(

9 tid l t9 l SEE ATTACHED SUPPLEMENTARY,JNFORMATION onnon4 h/ M 7 89 W. P. Steward, /

j' / VTV (( 6 to NAME. PHONE: (813) 866-4159 CPO 889 467

3- g

. SUPPLEMENTARY INFORMATION

. 1. Report No.: 50-302/77-74E

2. Facility: Crystal River Unit #3-

3. Report Date: 26 July 1977

4. Occurrence Date: 19 July 1977

5. Identification of Occurrence:

An unmonitored radioactive release to the atmosphere exceeding 100 pei/sec contrary to Environmental Technical Specifications 2.4.2.G & K, 5.6.2.A and Standard Technical Specification 3.3.2.1, Table 3.3-4,

6. - Conditions Prior to Occurrence:

Mode 1 power operation.

7. Description of Occurrence: -

At 10:45 in the progress of purging the Reactor Building, it was discovered that f.

radiation monitor RM-Al was inoperable. This constituted an unmonitored radioactive release to the atmosphere for a period of 22 minutes, at a release rate of 559.5 microcuries per second. The purge was ceroed immediately upon discovery and radiation monitor RM-Al restored cperable.

8. Designation of Apparent Cause:

The cause of this event was due to a proc: dural inadaquacy in that containment operating procedure OP-417- did not insure RM-Al running while purging the Reactor Building.

9. Analysis of Occurrence:

The health and safety of the plant and public were not affected as the 559.5 microcurie per second release rate for 22 minutes represented 0.041% of the maximum allowable instantaneous release rate.

10. Corrective Action:

The Reactor Building operating procedure OP-417 has been revised to ensure operability of radiation monitor RM-Al before commencias Henctor Building purge.

l

( 11. Failure 1:ata:

This was the first occurrence of this event.

l u .* =.a

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