ML20128D144
| ML20128D144 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 05/02/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8505280508 | |
| Download: ML20128D144 (2) | |
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. TENNESSEE VALLEY AUTHORITY.
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CHATTANOOGA. TENNESSEE 374ot j
.400 Che'stnut' Street Tower II
-BLRD-50-438/82-42 BLRD-50-439/82-38 x
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'U.S.' Nuclear Regulatory Commission 7
- , Region II~ _
Attn:
Dr.'J. Nelson Grace, Regional' Administrator 101 Marietta Street, NW, Suite.2900 1 Atlanta, Georgia 30323
-Dea'rl Dr. Grace:.
.BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - EVALUATION OF FLANGE JOINTS -
A BLRD-50-438/82-42, BLRD-50-439/82,
FINAL REPORT sThe subject deficiency was initially reported to NRC-OIE Inspector
.R.~V.ECrlenjak on June 1, 1982 in accordance with 10 CFR 50.55(e) as NCR
- BLN CEB 8205. This was followed by our interim reports dated July 2 and
. November 17, 1982, April'18, 1983 and April 10 and October to, 1984.
. Enclosed is our final report.-
'If you have any ' questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
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Very'truly yours, TENNESSEE VALLEY AUTHORITY
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J. W. Hufham,. Manager Licensing and Regulations Y
Enclosure pg' i00: Mr. James Taylor,_ Director (Enclosure) l- _
0ffice of(Inspection and Enforcement' i
~U.S. Nuclear Regulatory Commission
. Washington, D.C.
20555 L
- Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 i
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ENCLOSURE BELLEPONTE NUCLEAR PLANT UNITS 1 AND 2 EVALUATION OF FLANGE JOINTS NCR BLN CEB 8205 BLRD-50-438/82-42, BLRD-50-439/82-38 10.CFR 50.55(e)
FINAL REPORT Description ~of-Deficiency
' Flanged joints for ANS safety classes 2 and 3 alternately analyzed piping systems were not qualified in accordance with the ASME Boiler and Pressure' LVessel1 Code,Section III, paragraph'NC-3647 The alternately analyzed piping was analyzed using TVA's Office-of Engineering'(OE) Civil Engineering Branch
'(CEB)Lreport CEB-76-11, "BLN - Alternate Criteria for Piping Analysis and
. Support.".However,.this report did not delineate guidelines or methods for flange verification.. Planged joints are used in a number of. safety-related -
' systems such as the essential' raw cooling water (ERCW) system and the component cooling water (CCW) system at Bellefonte Nuclear Plant (BLN).
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TVA has determined the cause of this deficiency to be that because of known conservatisms in CEB-76-11, flanges were originally thought to be inherently qualified for piping supported in accordance with that criteria. Therefore, flange qualification procedures were not included in CEB-76-11.
. Safety" Implications Should the flanged joints on these systems become overstressed and fail
.during'a seismic event, the ERCW and CCW systems' capabilities to adequately dissipate the long-term residual heat from the reactor core after plant shutdown could be impeded. This condition could adversely affect the safe operation of the plant.
Corrective Action TVA has revised CEB-76-11 to include criteria for qualification of. flanges.
All flanges located in alternately analyzed. piping were identified and have been evaluated for compliance to the revised criteria. As a result of this evaluation, TVA has determined that all identified flanges are qualified to the new criteria'except for the pump suction and discharge flanges on chilled water pumps (2VE-MPMP-096-A and -271-A, IVE-MPMP-213-B and -161-B, and OVK-MPMP-004-B)'for the control building and auxiliary building safety-related air-conditioning. The bolting on these flanges will be changed to "high-
-strength" bolting which will qualify them.
The revision of CEB-76-11 will prevent recurrence of this deficiency.
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.All corrective actions for this item will be completed by September 1, 1985.
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