ML20096E150
| ML20096E150 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 08/14/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-2515, NUDOCS 8409060423 | |
| Download: ML20096E150 (2) | |
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TENNES!EE VALLEY AUTHORITY
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. Cl!ATTANOOGA. TENNESSEE 37401 -
400 Chestnut Street Tower II
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. BLRD-50-438/83-58 i
}BLRD-50-439/83-51 U.S. Nuclear Regulatory Commission 4
- Region III' W Attn: Mr. James P. _0'Reilly, Regional Administrator 101 Marietta Street, NW, Suite.2900-Atlanta, Georgia 30323
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - CARBON STEEL DONEL PIN FOUND IN
- HIGH-PRESSURE INJECTION PUMP - BLRD-50-438/83-58, BLRD-50-439/83 FINAL REPORT The-subject deficiency was initially reported to NRC-0IE Inspector Ross Butcher on November 9,1983 in mocordance with 10 CFR 50.55(e) as NCR e
2515. This was followed by our interia reports dnted December 6,.1983 and March 1,~1984. Enclosed is our final report.
If you have any questions, please get in touch' with R. H. Shell. at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY,
.Ih. N M,
L. M. 'Milla," Manager Nuolear Licensing.
Enclosure 00: Mr. Richard C. DeYoung, Director, (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records'Conter (Enclosum)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 5
PD b h ho h [38 8
PDR OFFICIAL COPV An Equal Opportunity Ernployw g
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ENCLOSURE-l BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 CARBON STEEL DOWEL PIN FOUND IN HIGH-PRESSURE INJECTION PUMP BLRD-50-438/83-58, BLRD-50-439/83-51 NCR 2515 10 CFR 50.55(e)
FINAL REPORT, y
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Descriptio'n of Deficiency The makeup high-pressure injection (MU/HPI) pumps are two-stage centrifbgal pumps designed and built by Bingham-Willamette of Portland, Oregon. The pumps contain a horizontal rotating element housed in a double casing. The outer casing, which carries the discharge pressure, is a fabricated pressure vessel with removable end covers secured by"1 series of studs.
The inner casing consists of two castings which are anchined and lapped at their mating surfaces and are bolt &t together around. the rotating element.
During a recent disassembly of one of 'the MU/HPI push)s, a carbon steel dowel pin was found in a tapered hole in the inner casing. The dowel pin was used to' align the intier casing during assembly and should have been removed following torquing of the inner case bolts. The pin was located such that it came in contact with the pump fluid and had rusted.
The apparent cause of the deficier.cy was the breakdown in the manufacturer's Quality Assurance program since the pump manufacturer failed to remove the dowel pin during the initial assembly of the pump and/or failed to provide TVA with information regardin inspection / removal of the pin.
Safety Implications Had this conditi)n remained tradetected, it is possible that the carbon-steel dowel pin could become loose inside the pump and possibly cause a significant degradation ornhe pump internals. Thus, in the event of an accident, the safe operation of the plant codld have been adversely affected due to the degraded pump's inability to fbnction as intended.
Corrective Action TVA has mn.oved the pin and the rust caused by the pin from pump INV-f1PMP-002A and has disassembled and inspected the two other unit 1 MU/HPI pthps.
No other dowel pins or rust were found.
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Based upon the unit 1 inspections performed by TVA and upon subsequent discussions with Bingham-Willamettei B&W has determined that the pin found in the subject pump was an isolated occurrence which does not affect other Bingham-Willamette pumps. As such, the unit 2 pumps will-not, be disassembled for inspection.
To prevent a recurrence of this problem, Bingham-Willamette is mvising the instruction manual for -the pumps to include a warning note in the pump assembly /dinassembly procedure indicating that the guide pins must be removed following torquing of the innor case. This will be complete by October 5, 1984.
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