05000296/LER-1981-016-03, /03L-0:on 810317,RHR Heat Exchanger 3C Was Removed from Svc for Mod & HPCI Turbine Exhaust Diaphragm Ruptured. Caused by Excessive Turbine Exhaust Pressure.Disc Replaced

/03L-0:on 810317,RHR Heat Exchanger 3C Was Removed from Svc for Mod & HPCI Turbine Exhaust Diaphragm Ruptured. Caused by Excessive Turbine Exhaust Pressure.Disc Replaced

ML20003E855
Person / Time
Site:	Browns Ferry
Issue date:	04/08/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003E854	List: 05000296/LER-1981-016, Forwards LER 81-016/03L-0 05000296/LER-1981-016-03, /03L-0:on 810317,RHR Heat Exchanger 3C Was Removed from Svc for Mod & HPCI Turbine Exhaust Diaphragm Ruptured. Caused by Excessive Turbine Exhaust Pressure.Disc Replaced
References
LER-81-016-03L-01, LER-81-16-3L-1, NUDOCS 8104170394
Download: ML20003E855 (2)

LER-1981-016, /03L-0:on 810317,RHR Heat Exchanger 3C Was Removed from Svc for Mod & HPCI Turbine Exhaust Diaphragm Ruptured. Caused by Excessive Turbine Exhaust Pressure.Disc Replaced

Event date:
Report date:
2961981016R03 - NRC Website

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NHC FuMM Ab' LICENSEE EVENT REPORT

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8 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o 12 l l During normal operation, 3CRHR Htx was removed from service at 0500, and l

at 0930 during a HPCI surveillance test, the, HPCI turbine exhaust diaphragm Le_L3J l_ _

3C RHR heat exchanger was returned to service within 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> and ruptured.

the HPCI within 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br />. No hazard to public hea'.th or safety existed. See i

ITTC I technical specification 3.5.E.3.

No previous occurrences.

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corm BF-17 Tenir nec Valley Authority BF 15.2 lir. e : Ferry Nuclear Plant 1/10/79 LE!t SUPPLEMENTAL INFORMATION 3FRC 50-296 /

8116 Technical Specif teati.>n involved _ 3.5 E.3 6.7.2.b (2) itept,.ted Under Techni Al Specification Date f Occurrence 3/17/81 Time of Occurrence 0930 Unit 3

!.lentification and Description of Occurience:

During normal operation, 3C RER Htx was. removed from service at 0500, and at 0930 during a HPCI test Tun, the HPCI turbine exhaust diaphragm was ruptured. 3C RRR heat exchanger and HPCI were both returned to service the same day.

Ccnd tions Prior to Occurrence:

" Unit T'T ea.oi.

Unit 2 @ 99%

Unit 3 @ 100%

Acte *i speified in the Technical Specification Surveillance Requirements met due. ;. inoperable equipment.

Describe.

Sur'veillance requirements for all equipment specified in Technical Specification 3.5.E.2 was met, except for 3C RHR Ex (LPCI), thereby entering into Technical Specification LCO 3.5.E.3.

3C RHR Ex (1PCI) was returned to service within 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, which satisfies Technical Specifications 3.5.E.3 and 3.5.E.2.

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,\\; n : <mt Cause of Occurrence:

Excessive turbine exhaust pressure.

\\n1lI. sis of Occurrence:

There was no damage to plant equipment. There was no activity release, no personnel exposure or injury and no danger to,the health or safety of the public.

Cort.:tive Action:

Replaced ruptured disc.

'.3itu o Data:

None "R. ' t ntion :

Period - Lifetime; Responsibility - Administrative Supervisor dReve.on: