ML19340A459

RO 77-103E:on 770903,unplanned Radioactive Gas Release to Auxiliary Bldg Occurred.Caused by Concentrated Waste Storage Tanks Loop Seals Being Blown.Loop Seals re-established & Sys Mods Initiated to Prevent Future Occurrences

ML19340A459
Person / Time
Site:	Crystal River
Issue date:	09/09/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19340A456	List: ML19340A455 ML19340A459
References
NUDOCS 8003260798
Download: ML19340A459 (2)

Text

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'N LEENSE EVENT tCENSEE *

• TYPE TYPE LCENSE NUMBER l411l1l1l1l l0l1l NAME

] (f l L l Cl R l P l 314] l 0 l 0 l-l 0 l 0 l 0 l 0 l 0 l-l 0 l 025l 26 30 31 32 89' 15 .

EVENT DATE REPCRT CATE u DOCKET NUMBER CATEGORY T PE l0 l5 l0 l-l0 l3 l0 l268l l0 l9 l0 l3 l 7l 7l l 0 l 9 l0']9 l7 l7

] CONT l -l 58 u 57

-l 59 W60 61 69 74 75 &,

EVENT DESCRIPTON 3 l In mode 1 operation, an unplanned radioactive g. .. release to the Auxiliary Building - #- o C9 Redundancy N/A. . ,

}loccurredcontrarytoEnvironmentalTechnicalSpecification5.6.2.A. -

E R9 The sixth occurrence of this event.

j l The guxiliary Building was evacuated immediately.

B9 (LER 77-103E)

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-E VOLATCN C DE ODE COMPONENT CODE

[Z,j lZ l 9l 9l 9l47 lN l l l'M] Bl 39 10 Q 11 lZ l Zl Zl Zl ZI Zl 12 17 43 44 48 CAUSE DESCRIPTION ') .

l [ This occurrence was due to the concentrated waste storage tanks loop seals being blown. E: l 19 j l l The loop seals were re-established. Proposed. system modifications should preclude 6;

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1l recurrence.

I e; I I9 METHOO OF

• FACILrry DISCOVERY DESCRIPTON

% POWER OTHER STATUS DISCOVERY STATUS l High radiation on RMA-2g & 3G shutting y l0l9]9]12 l13 NA l 44.

lAj 45 46 SC I L 9 10 ~

.(See additional factors 18) ,

gAMjF LOCATCN OF RELEASE RELEASED AMOUNT OF AcTMTV y l Release to Aux. Bldg. vent to atmosphere 9

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'OF RELEASE l 57 curies noble gas 10 11 l

44 45 BC j j

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTON Ininini Iz_l l NA 9 11 12 13 PERSONNEL INJURIES

• NUMBER DESCRIPTON I NA l0l0l0l'l 6C 9 11 12 OFFSITE CONSEQUENCES 9 .

yl LOSS OR OAMAGE TO FACIUTY TYPE DESCRPTON NA d (l10 9

PUBUCITY NA l

ADDITIONAL FACTORS 8003260'7 /

off Auxiliary Bld;; ventilation fans.

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SEE ATTACHED SUPPLEMENTARY INFORMATION l

v. P'. Stewart - ( \T PsONE: 813/866-41s9

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SUPPLEMENTARY INFORMATION Report No.: 50-302 /77-103E Facility: Crystal River Unit #3 Report Date: 9 September 1977

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Occurrence Date: 3 September 1977 Identification of Occurrence:

Unplanned gu release reported in accordance eith ETS 5.6.2.(A).

Conditions Prior to Occurrence:

Normal power operation. Prepering to vent Makeup Tank via low pressure Waste Gas Header..

Description of Occurrence:

At 0716 upon venting the Makeup Tank to the low pressure Waste Gas Eeader, airborne radiation monitors RMA & RNA-3 alarmed ' actuating appropriate ventilation trips.

Subsequent investigation revealed that the source of the release was the loop seal on the miscellaneous Waste Evaporator. Loop seal was re-established upon discovery.

The maximum release' rate at the peak of the discharge profile was 0.53% of the most restrictive limit set forth in Environmental Technical Specification 2.4.2.A(1) .

System modifications to prevent occurrences of this nature have been initiated and -

submitted to Production Engineering.

Designation of Apparent Cause:

Pressure in the low pressure Waste Gas Header exceeded loop seal capability.

Analysis of Occurrence:

There was no consequence to the health or safety of the plant or public because of the very small release rate.

Corrective Action:

Proposed modifications noted in the Description of Occurrence should preclude recur-rence of this nature.

Pailure Data:

[

This has been a repetitive problem.

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