ML19345G592
| ML19345G592 | |
| Person / Time | |
|---|---|
| Site: | Phipps Bend  |
| Issue date: | 03/31/1981 |
| 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, PBRD-50-553-81, NUDOCS 8104070570 | |
| Download: ML19345G592 (3) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374o1 400 Chestnut Street Tower II PARD-50-553 /81-02 March 31, 1991 A.
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Mr. James P. O'Reilly, Diractor s' 'i (s 4Ap 0 ##i.;j Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission OJ og 6 /pg', A -y Region II - Suite 3100
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Atlanta, Oeorgia 30303
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Dear Mr. O'Reilly:
W\\gn-PHIPPS BEND NUCLEAR PLANT UNIT 1 - REPORTABLE DEFICIE' ICY - FAILUPE TO RADIO 0RAPH RPV PEDESTAL WELDS AND BTPASSINO HOLD POINTS ON CONCRETE POUR - PBRD-50-553/81-04 On December 23, 1980, the deficiency involving the failure to radiorrach reactor pressure vessel pedestal welds wac initially reported to NRC-0IE, Region II Inspector, W. 3. Swann as NCR PBNP-175. On January C,
- 1081, the deficiency involving the bypassing of hold points during concrate pours was initially reported to NRC-0IE, Region II Inspector, R. W. Wright as NCR PBNP-184. The firet interi:n report on the subject deficiencies was submitted on January 22, 1981.
In compliance with paragraph 50.55(e) of 10 CFR Part 50, we are enclosing the second interim report en the subject deficiencies. TVA anticipates transmitting the final -apert en or before June 10, 1081.
If you have any qCestions, please call Jim Domer at FTS 857-2014.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Enclosure l
cc:
Ma. Victor Stello, Director (Enclosure)
Office of Inspection and Enforcement II.S. Nuclear Reaulatory Commission Washington, DC 20555 5
fi 8104070670 9i I
j An Ecual Occortumty Emoloyer
d ENCLUSURE PHIPPS BEND NUCLEAR PLANT UNIT 1 FAILURE TO RADIOGRAPH RPV PEDESTAL WELDS AND BYPASSSING HOLD POINTS ON CONCRETE POUR 10 CFR50.55 (e)
PBRD-50-553/81-04 REFORT NO. 2 (INTERIM)
On December 23, 1980, TVA informed NRC-0IE Region II Inspector, W. B.
Swan, of a potentially, reportable condition under 10CFR50.55(e) regarding the failure to radiograph reactor pressure vessel (RPV)
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pedestal welds for Phipps Bend Nuclear Plant unit 1.
On January 9, 1981, TVA informed NRC-0IL Region II Inspector, R. W. Wright, of a potentially reportable condition under 10CFR50.55(e) regarding the bypassing of hold points on a concrete pour to the same unit.
Description of Deficiency T,he deficiency involves the T-bar weld joints between the upper.and lower segment of the RPV pedestal. These weld joints did not receive a 10-percent radiographic examination as required by GE/C. F. Braun specification 300-05 and shown on GE/C. F. Braun drawing SK-016.
Also, the exterior and laterior girth welds were not radiographed in accordance with GE/C. F. Braun specification 300-05 due to an inconsistency between the radiographic locations shown on GE/C. F.
Braun drawing SK-015 and TVA's weld joint. numbering system.
The welds are inaccessible such that the specified NDE cannot be performed because cencrete has already been poured for the RPV '
pedestal. This pour was performed even though some hold points (including NDE) were not properly dispositioned.
Corrective Action A review of all available documentation and examination records has revealed the following.
- The T-bar weld seams were subjecte' to (1) a fitup inspection which was documented as acceptable, (2) inprocess visual examinations
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conducted by the Quality Control _ Welding inspectors throughout the weld process, and (3) magnetic particle examinations of the completed weld joints which were documented acceptable. Quality Control Welding inspectors were assigned full-time duty to welding activities on the RPV pedestal.T-bars while this welding was being performed.
The entire interior. and' exterior girth seams were subjected to (1) a
- fitup inspection which was documented as acceptable,- (2) visual and aagnetic particle examination of the excavation cavity which was documented as acceptable, (3) a final visual and magnetic particle
- examination of the. completed weld. seam which was' documented as
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acceptable, and (4) inprocess visual examinati0ns throughout the welding.
In addition, all available. radiographic examination documentation en the interice and exterior girth seams is being reviewed.
GE/C. F. Braun are evaluating this documentation and will provide the design disposition to TVA. TVA will obtain the GE/C. F. Braun disposition on this deficiency before resuming work on the RPV pedestal.
The QA program for work release closure before concrete placement i
and' the strict adherence of hold points will be the subject of formal i
directives frem upper management onsite. These directives will address specific respcesibilities for craftsmen, engineers, and quality control inspectors with regard to strict adherence to procedural requirements in the completion of work releases before the placement of concrete. The directives will be issued before May 15, 1981.
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