ML20056B683
| ML20056B683 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 02/15/1972 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 9102080347 | |
| Download: ML20056B683 (6) | |
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NORTHERN STATES POWER COMPANY M I N N E A PO LI S. M lN N E B OTA 5 5 401
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February 15, 1972 6
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Dr. Peter A Itrris, Director t EB17197g e, 2.E 4
<9 Division of Beactor Licensing E M CRY C
United States Atomic Energy Commission b HEC
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Dear Dr. Morris:
MONI'ICELLO NUCLEAR GENERATING PIANT Docket No. 50-263 License No. DPR-22 Supplementary Report on Ihmage to Torus Baffles A letter reporting the damage to torus baffles and the status of repair work vas transmitted on December 15, 1971, in compliance with the 30-day reporting requirement of Section 6.6.C.1 of Appendix A, Technical Specifications of Provisional Operating License DPR-22.
The following information supplements the Ibcember 15,1971, letter and summarizes the completion of inspection and repair work.
At the time of the prior report, all torus baffles had been removed.
The re-lief va3ve discharge lines were being modified as recommended by the General Electric tr rus design engineers. Repairs were in progress on small lines and catvalk brac _ng.
Consideration was also given for repair of the painted sur-faces.
Since the last report, all small lines have been restored to their original condition.
Likewise, the structural support bracing for the torus catvalk has been repaired. The modifications to the relief valve discharge lines have been completed as described in the previous report. The lines were extended under the torus water level and terminated with a ram's head type tee as shown on the attached sketches.
Special tests were conducted to assure the integrity of the torus metal. All significant scratches attributed to baffle movement on the torus valls were subjected to a magnetic particle test; the test showed the base metal to be of satisfactory integrity in all cases. Areas where paint was removed by steam discharged from the relief valve lines against the torus vall were magnetic particle tested and found acceptable.
In addition, the vall thickness was men-sured; it was found that no measurable metal erosion had occurred. A group of original pipe connection and structural velds on the inside and outside of the torus were magnetic particle tested. All velds were satisfactory with the ex-ception of two velds connecting each relief valve discharge line brace to the i
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91020B0347 720215
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NORTHERN STATES POWER COMPANY l
4 P A Marris February 15, 1972 torus skin. A small crack was found at the end of each veld which penetrated i
slightly into the surface of the torus metal.
In each case, the veld was re-paired in accordance with applicable code requirements.
hat brace is no long-er used.
Le design modification called for bracing to be connected between two torus ring girders rather than velded to the torus skin. A stress analysis shows that a similar failure is not expected in the modified design.
Paint was earlier reported to be damaged in a number of places. All loose paint was removed and a base primer was applied as necessary. Affected areas were re-painted to restore the original quality of metal surface protection.
The Safety Audit Committee reviewed the work completed and plane for additit nal torus work at the Ibcember 15 and 16,1971, meeting.
They discussed final 2 s-olution of all work at the January 19 and 20,1972, meeting. All torus work was essentially completed at this time.
The committee saw no safety consideration restraining continued plant operation in light of the removal of the baffles, modifications of the relief valve discharge lines, and other torus repair work.
j All quality assurance supervision and documentation was done under the direction and supervision of the Quality Assurance Section of the Northern States Power Company, Plant Engineering and Construction Department.
A detailed report of all torus repair work done including quality assurance doc-umentation is available at the lenticello site for Compliance Inspectors.
Yours very truly, 0.
L 0 Mayer, P.E.
Director-Nuclear Support Services LOM/MIV/br ec: 3 H Grier Attach ~. ients i
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