ML20050D554

LER 82-022/03L-0:on 820305,HPCI Declared Inoperable When Preliminary Design Review Did Not Confirm Loose Mounting Plate on Spring Can Hanger EBB-14-H8.Caused by Degraded Condition of Red Head Concrete Expansion Bolts

ML20050D554
Person / Time
Site:	Duane Arnold
Issue date:	04/02/1982
From:	Varner D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20050D550	List: ML20050D548 ML20050D554
References
LER-82-022-03L, LER-82-22-3L, NUDOCS 8204120311
Download: ML20050D554 (2)

Text

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EVENT oESCRIPTION AND PROSA8t.E CCNSECUENCi$

lo 121 l During normal operation, llPCI was declared inoperable when a preliminary I go,3, l design review did not confirm that a loose mounting plate on sprino can I rot 6 1 I hanger EBB-14-H8 would not adversely affect the operability of HPCI. HPC I

g i I steam supply valves closed and system depressurized. 7-dy LCO was ent I 10 la 1 l ered per TS 3.5.0.2. Desion review resnitod from previonsiv identified n I la i 7 I I onconformance. Further review revealed that EBB-14-H8 was not required f I g o ,s i l or safe operation of HPCI. Not repetitive occurrence. 80 I

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IX!@lDl@ IZ IZ l@ 101010i41 L.YJ@ l N i@ ! Al@ l. B l 210 l 91@ l n 2. n l@ a v 2 2 CausE oEsCRIPTICN ANO CCARECTIVE ACTICNS h li t a l i The loose mountino plate on FB4-14-H8 caused bv daaraded condition of "R I li t i l l ed Head" concrete exnansion bnits. A tomnorary Mnerex inctallod noar 1 i e i 2 [l EBB-14-H8 using "Hilti" concrete expansion bol ts. After this installatio I gil31 l n, HPCI was functionally tested satisfactorily and declared operable. ER I t i t i l B-14-HR will be repaired. Desian review of anchor bolts olanned.  !

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I N AVE OF PR(P A AER l

DUAllE ARil0LD EllEP,GY CEllTER Iowa Electric Light and Power Company

' Licensee Event Report -Supplemental Data Docket flo. 050-0331 Licensee Event Report Date: 4-2-82 Reportable Occurrence flo.: 82-022

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Event

Description:

During normal operation, the high pressure coolant injection (HPCI) system was-declared inoperable when a preliminary design review did not confirm that a loose mounting plate on spring can hanger EBB-14-H8 would not adversely affect the operability of the HPCI system. The HPCI steam supply valves were closed and the system depressurized. A 7-day limiting condition for operation (LCO) was entered as required by Technical Specification 3.5.D.2 for an inoperable

- HPCI. The hanger is located on the HPCI steam supply line. The design review was being conducted as a result of the hanger mounting plate problem having previously been identified in a nonconformance report.

Further review of the design of the HPCI system revealed that failure of spring can hanger EBB-14-H8 would not have adversely affected the operability of the HPCI. This design review concluded that in the event of the ultimate failure of hanger EBB-14-H8, the HPCI system has sufficient capacity to absorb the additional load without excess stress or unacceptable deflections. As a result of this conclusion, HPCI was declared operable again after approximately 1.4 days, concurrent with the installation of a temporary hanger near EBB-14-H8.

There have been no previous similar occurrences.

Cause

Description:

- The loose mounting plate on EBB-14-H8 was caused by the degraded condition of the " Red Head" concrete expansion bolts.

l' Corrective Action:

i A temporary hanger was installed on the HPCI steam supply line near EBB-14-H8 using "Hilti" concrete expansion bolts. After this installation, HPCI was functionally tested satisfactorily and declared operable. EBB-14-H8 will be ,

repaired and the temporary hanger then removed.

A design review will be initiated to determine if the problem with mounting '

plate EBB-14-H8 has generic implications.

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