ML20087H711
| ML20087H711 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/14/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8403210132 | |
| Download: ML20087H711 (2) | |
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TENNESSEE: VAi. LEY AUTHORITY CHATTANOOdA, TENNESSEE 374ot 400 Chestnut Street Tower II
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ch'14,' 1984 BLRD-50-438/84-19 BLRD-50-439/84-18 U.S. Nuclear Regulatory Commission Region II Attn: L Mr. James P.- O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
- BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - DEFECTS IN REACTOR PRESSURE VESSEL STUD HDLES - BLRD-50-438/84-19, BLRD-50-439/84 FIRST INTERIM REPORT The subject deficiency was initially reported for unit 1 to NRC-0IE Inspector P. E. Fredrickson on February 16, 1984 in accordance with 10 CFR 50.55(e) as NCR 2857. NCR 2915 was subsequently idatified which documented the deficiency for unit 2.
We shall be reporting on both NCRs simultaneously. Enclosed is our first interim report.
If you have-any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY Th.MLL L. M. Mills, Manager
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Nuclear Licensing
, Enclosure cc:- Mr. ~ Richard C. DeToung, Director (Enclosure)
Office of Inspection and Enforcement
-U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations '
1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia : 30339 L
7,9 Qho 3G p.
8 oFFICI AL COPY,
1983-TVA SOTH ANNIVERSARY An Equal Opportunity Employer
y,N-ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 DEFECTS IM REACTOR PRESSUPE VESSEL STUD HOLES BLRD-50-438/84-19, BLRD-50-439/84-18 NCRs 2857 AND 2915 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency It' was' identified that 56 of the 60 unit 1 reactor pressure vessel (RPV) stud bolt. holes have damaged, corrosion pitted, tool chattemd, stained and rough threads. Five of the stud holes wem rejectable when checked with the zvendor-supplied no-go gage (used for checking
' dimensional configuration of the threads). This was documented on Nonconformance Report (NCR) 2857.
This; condition has subsequently been identified as applicable to unit 2 in that 57 of the 60 unit 2 stud holes have similar corrosion damage, tool chatter and rough threads. Of the 58 stud holes gaged, six t ere rejectable when checked 'with go and no-go gages. Two of the RPV stud holes were not checked due to the insertion of alignment studs. This condition for unit 2 has been documented on NCR 2915 TVA has determined that the corrosion damage and staining is due to a lack of adequate preventive maintenance and inspections.- Some of the
. damaged threads may be due to mLahandling of the temporary studs during installation of the RPV. Preventive maintenance was inadequate
~ because the ' manufacturer's maintenance instructions were not wholly included on the maintenance inspection requirements sheet, attachment
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- B of Bellefonte Nuclear Plant Quality Control Procedum. (BNP-QCP) 1 3
" Preventive Maintenance."
Interim Progress The subject NCRs have been referred to TVA's Division of Engineering Design (EN DES) to determine the acceptability of the present condition of the RPV stud bolt holes, and to determine the repair procedures to be used as required. EN DES has contacted the vendor, Babcock and Wilcox, and will consider the vendor's moommendations in the resolution of this deficiency.
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' The amintenance inspection requirements sheet, attachment B of BNP-QCP j
1 3,- has been revised to include the vendor's requirements for inspection of. the RPV stud bolt holes. This includes insoeoting monthly for cleanliness, rusting, pitting, and other deterioration, and to require the reapplication of the recommended protective coating
< on the threads at 6-month intervals. All protective caps and 0-Rings are to be verified to be in place monthly.
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