05000293/LER-1980-034, Updated LER 80-034/03X-1:on 800701 & 16,HPCI Turbine Discharge Line Snubber Found Severed & HPCI Declared Inoperable.Caused by Transient Hydrodynamic Shock During Startup & Shutdown of HPCI Turbine

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Updated LER 80-034/03X-1:on 800701 & 16,HPCI Turbine Discharge Line Snubber Found Severed & HPCI Declared Inoperable.Caused by Transient Hydrodynamic Shock During Startup & Shutdown of HPCI Turbine
ML20077A769
Person / Time
Site: Pilgrim
Issue date: 07/06/1983
From: Harrington W, Vender J
BOSTON EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
83-174, LER-80-034-03X, LER-80-34-3X, NUDOCS 8307220430
Download: ML20077A769 (2)
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LER-2080-034, Updated LER 80-034/03X-1:on 800701 & 16,HPCI Turbine Discharge Line Snubber Found Severed & HPCI Declared Inoperable.Caused by Transient Hydrodynamic Shock During Startup & Shutdown of HPCI Turbine
Event date:
Report date:
2932080034R00 - NRC Website
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text

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.. . , UPDATE REPORT PREVIOUS REPORT DATFr 07/31/80

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EVENT DESCRIPTION AND PRO 6ABLE CONSEQUENCES h l o l2 l l0n July 1,1980 HPCI Turbine Discharge Line Snubber No. S23-3-31 was found severedl.

1013110n July 16, 1980 an upstream snubber on the same line Snubber #23-3-36 was found I l o l4 l l severed. On both occasions the HPCI system was declared inoperable and "in-kind" l l o l 5 l l replacements installed. Following the July 1,1980 maintenance the system was sat-]

l o l 6 l lisfactorily tested and returned to service. During the post maintenance testing on!

lol7ll July 16. the Hinh Pressure Pumo casina nasket was found leakinn and had to be re- l l 0 l e l ll P aced. Following its replacement, the system was satisfactorily tested and re- l r .

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TAMEN ACTON ON PL ANT M ET NC D HOURS 22 SUB TT E D FORMSug, SUPPLIE MANUFACTURER lF l@lZ l@ lZl@ [Zj@ l 0 l 010l0 l lNj@ lN l@ l Al@ lB l2 l0 l 9 l 38 34 35 34 37 4. 40 43 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i l o l l Cause : Transient hydro dynamic shock during startup and shutdown of the HPCI l l 1 l 1 l l e,,vhinn Analysis disclosed the need for additional snubbers and higher capecity l f1 l 2 l l snubbers. l l 1 l 3 l l Corrective Action: Existing snubbers were upgraded and 2 additional snubbers l 3 l 4 l l were added. PDCR's 80-47 and 81-62. l 7 8 .

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P DES PT O NA l 1l 9 l l Z lgl l sesWENISCRiPTiON h NRC USE ONLY NA lllllllllllll 12l o l l N l@la l NAME OF PREPARER J. Vender PHONE: 617-746-7900 ,; 7

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BOSTON EpisON COMPANY B00 BOvtsTON STREET BOSTON. M AssACHusETTs 02199 WILLIAM D. HARRINGTON etesson vets passessest o .6..e July 6,1983 BECo. Ltr. #83 174 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Docket Number 50-293 License DPR-35

Dear Sir:

The attached Licensee Event Report UPDATE, 80-034/03X-1, "HPCI Snubber",

is hereby submitted in accordance with the requirements of Pilgrim Nuclear Power Station Technical Specification 6.9.B.2.b.

If there are any questions on this subject, please contact us.

Respectfully submitted,

. i g i 14Mc'"-kvi William D. Harri gton WDH/mg

Enclosure:

LER 80-034/03X-1 ,

cc: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Standard BECo. LER Disiiribution i

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