ML19269C946

LER 79-013/03L-0:on 790116,when Makeup Pump 1 Started for Surveillance testing,1/2 Inch Nipple at Discharge of Attached Gear Driven Lube Oil Pump Failed,Resulting in Oil Spray Which Required Pump Shutdown

ML19269C946
Person / Time
Site:	Davis Besse
Issue date:	02/12/1979
From:	Adams J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19269C945	List: ML19269C944 ML19269C946
References
LER-79-013-03L, LER-79-13-3L, NP-33-79-17, NUDOCS 7902210254
Download: ML19269C946 (2)

Text

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U. S. NUCL E AR RC F ORM 366 (7 771 g, LICENSEE EVENT REPORT (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATIONI CONTROL SLOCK: l l l l l l l I o FOT110111 in is is 111g1010 l- 1010 IN le IP i- 10 l a i I@

23 I@l4 11 11 TYIPE t i t i@l LICENSL 40 57 4AI bd 26 I4 IS LICENSE NVP/dtH 7 8 9 LICENSEE COOL CON'T C 1

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bd 69 EVENT DATE 74 75 HEPORT D ATE 80 7 8 60 COCK ET NVUd ER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h a j 1727 hours0.02 days <br />0.48 hours <br />0.00286 weeks <br />6.571235e-4 months <br /> on 1/16/79 when Makeup Pump 1 was started for surveillance testing, l o 2 lAt l

the discharge of the attached gear driven lube oil pump failed which 1o131 1 1/2" nipple at The unit was placed in the Actioni o 4 l caused an oil spray requiring shutdown of the pump.

There was no danger to the health and safety of the l ,

ITTTl Istatement of Tech Spec 3.1.2.4.

A shutdown of the unit for al l o Is l lpublic or unit persc..nel. Makeup Pump 1-2 was operable.

(NP-33-7 9-17 ) l iTTTl Ipianned outage was in progress when the event occurred.

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12 la 18 13 20 REVISION 9 to 11 REPOHT 7 8 OCCURHENCE SEQUENTI AL TYPE No.

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41 42 43 44 47 CAUSE DESC11PTION AND CORRECTIVE ACTIONS The l g lThe cause is suspected to be fatigue failure caused by vibration of the piping.

An inspection of lube oil sys-1 g,,ij l nipple and bushing that it threads into were replaced.

j g gtems on both makeup pumps was made for evidence of any potential f ailures and none

, 3 lwere found.

I g I- 80 7 8 9 IS OV RY OlSCOVERY DESCRIPTION

• . POWER OTHER STATUS STA S 5011.01 l

[1_lf_j [G_j h l0l0l0ihi NA l l B [@l Surve111ance Test ST A TIVITY CO TENT LOCATION OF RELEASE AMOUNT OF ACTIVITY 1 6 RtLFy 10 NA ASED@OF RELE ASE@l11 44 l l 45 NA 80 7 8 9 PERSONNEL EXPOSURES NUMBE R TYPE DESCRIPTION 1 7 l0l0l0l@lZl@l NA PERSONNEL INJu IES NUYBER DE SCRIP TION 1 rrm8 1010 7 9 in lei NA 11 12 80 LOSS OF CH D AY AGE TO F ACILITY TYPE DESCnipTION l

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR PONER STATION UNIT ONE SUPPLEMENTAL INFOR'fATION FOR LER NP-33-79-17, i DATE OF EVENT: January 16, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Makeup Pump 1 was inoperable Conditions Prior to Occurrence: The unit was in Hot Standby (Mode 3) with Power (MWT) = 0, and Load (Gross MWE) = 0, Cooldown was in progress.

Description of Occurrence: At 1727 hours0.02 days <br />0.48 hours <br />0.00286 weeks <br />6.571235e-4 months <br /> on January 16, 1979, Makeup Pump 1 was started for an operational test in accordance with ST 5011.01, " Boron Injection Flowpath Test". Failure of a 1/2" nipple at the discharge of the attached gear driven lube oil pump caused an oil spray which required shutdown of the pump.

At 1730 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.58265e-4 months <br />, Makeup Pump 1 was declared inoperable. The unit was placed twoin the Makeup Action Statement of Technical Specification 3.1.2.4, which requires that Pumps be operable in Modes 1, 2, 3, and 4 (Mode 4 with Reactor Coolant Systen pres-sure 7150 psig). The Action Statement requires that the inoperable pump to be in an operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or the unit be in Hot Standby (Mode 3) within the next six hours.

Designation of Apparent Cause of Occurrence: The cause of the failure of the pipe Proper nipple is suspected to be fatigue failure caused by vibration of the piping.

materials were installed, and there is no visual evidence of improper installaticn or any excessive mechanical force.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. Makeup Pump 2 was operable. A shutdown of the unit for a planned outage was in progress when the event occurred. The unit went into Mode 5 (cold shutdown) at 1815 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.906075e-4 months <br /> on January 17, 1979.

Corrective Action: On January 18, 1979, under Maintenance Work order 79-1298, the nipple that f ailed and bushing that it th cads into were replaced. An inspection of lube oil systems on both makeup pumps was made for evidence of any potential failures and f ound none. After satisfactory completion of ST 5011.01, on Makeup Pump 1, the pump may be declared operable, removing the unit from the Action State-ment of Technical Specification 3.1.2.4.

Failure Data: Although there have been previous reports concerning oillube leakoil leaks, outboard (NP-33-78-107 - oil leak inboard deflector disc and NP-33-7/-073 -

bearing end plate), this is the first occurrence of a piping failure.

LER #79-013