ML20039C315
| ML20039C315 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/21/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8112290219 | |
| Download: ML20039C315 (2) | |
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400 Chestnut Street Tower II December 21','196i
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BLRD-50-438/81-75 BLRD-50-439/81-74
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~. O'Reilly, Director Mr. Jamea t
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Office of Inspection and Enforcement 4
U.S. Nuclear Regulatory Commission j
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Region II - Suite 3100 gEC k
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Dear Mr. O'Reilly:
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - OVERPRESSURE PROTECTION IN THE DECAY HEAT REMOVAL SYSTEM - BLRD-50-438/81-75, BLRD-50-439/81 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector C. Julian on November 27, 1981 in accordance with 10 CFR 50.55(e) as NCR BLN BLP 8127. Enclosed is our first interim report. We expect to submit our next report by April 20, 1982.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY
.TY)
L. M. Mills, Manager Nuclear Regulation and Safety Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission gf, N Washington, DC 20555 3
I u,w.v ? 6 8112290219 811221 PDR ADOCK 05000438 g
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 OVERPRESSURE PROTECTION IN THE DECAY HEAT REMOVAL SYSTEM 10 CFR 50.55(e)
BLRD-50-438/81-75, BLRD-50-439/81-74 FIRST INTERIM-REPORT Description of Deficiency The Decay Heat Removal System (DHR) cooler inlet relief valve discharge and the cooler outlet relief valve discharge have been combined into a single discharge header. The line size of the common header is the same as the relief valve discharge lines. This is in violation of ASME Section III, NC3677 3(d) which states that, "in no case shall the area of such common lines be less than the combined area of all lines discharging into it."
This condition exists on both trains A and B for both units.
This situation arose as a result of changes made to comply with item 2.1.6.a of NUREG-0578. The 2-inch relier valve discharges were combined into a single line and connected to a 2-inch embedded drain line. This problem was discovered during a check of the system drawings for other changes.
Interim Progress TVA is in the process of rerouting the relief valve discharges. Because the embedded drain piping runs through other rooms of the building, TVA is reviewing the present design to determine that no other relief valves from other systems discharge into the embedded lines that will be used as the discharge lines for the subject valves.