ML16341G685
| ML16341G685 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/04/1992 |
| From: | Rood H Office of Nuclear Reactor Regulation |
| To: | Rueger G PACIFIC GAS & ELECTRIC CO. |
| Shared Package | |
| ML16341G686 | List: |
| References | |
| TAC-M83285, NUDOCS 9209160074 | |
| Download: ML16341G685 (6) | |
Text
I I
September 4,
1992 4
Docket No. 50-275 J
- Hr. Gregory H. Rueger Nuclear.,Power;, Generati'on, B14A
" 'Pacific-Gas and Electric Company 77 Beale Street, Room 1451 P.O; Box 770000 San "Francisco, California 94177
Dear Hr. Rueger:
9
SUBJECT:
EVALUATION OF DIABLO CANYON UNIT 1
SUPPLEMENTAL REACTOR VESSEL RADIATION SURVEILLANCE PROGRAM (TAC NO. H83285)
By letter dated March 31,
- 1992, you requested that the NRC staff review and approve a proposed supplemental reactor vessel radiation surveillance program and a revision to the reactor vessel material surveillance capsule withdrawal schedule for Diablo Canyon Unit 1
(DCPP-1).
In our safety evaluation, which is enclosed, we conclude that the placement of supplemental capsules in the DCPP-1 reactor vessel is acceptable.
- Also, we conclude that the revised withdrawal schedule is acceptable.
- However, we request that you reevaluate the withdrawal schedule when test results from irradiated capsules become available or if the DCPP-1 fuel management program is significantly changed.
In addition, our safety evaluation concludes that the samples from the broken weld metal Charpy specimens may be used to determine the effect of radiation and annealing, if you demonstrate that the reconstitution process does not affect the Charpy test results.
In addition, if you decide to anneal the DCPP-1 reactor vessel at some future time, all standby capsules should be annealed in order to maintain their materials in a condition equivalent to that of the reactor vessel.
This completes the staff effort on this issue and closes TAC Number H83285.
If you have any questions regarding this issue,, please contact me.
Sincerely, MICJHI.E WC~H'
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PDR Original signed be Harry Rood, Senior Project Manager Project Directorate V
Division of Reactor Projects III/IV/V 090083
Enclosure:
Safety Evaluation cc w/enclosure:
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Docket No. 50-275 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 September 4,
1992 Mr. Gregory H. Rueger Nuclear Power Generation, B14A Pacific Gas and Electric Company 77 Beale Street, Room 1451 P.O, Box 770000 San Francisco, California 94177
Dear Hr. Rueger:
SUBJECT:
EVALUATION OF DIABLO CANYON UNIT 1
SUPPLEMENTAL REACTOR VESSEL RADIATION SURVEILLANCE PROGRAM (TAC NO. M83285)
By letter dated March 31,
- 1992, you requested that the NRC staff review and approve a proposed supplemental reactor vessel radiation surveillance program and a revision to the reactor vessel material surveillance capsule withdrawal schedule for Diablo Canyon Unit 1
(DCPP-1).
In our safety evaluation, which is enclosed, we conclude that the placement of supplemental capsules in the DCPP-1 reactor vessel is acceptable.
- Also, we conclude that the revised withdrawal schedule is acceptable.
- However, we request that you reevaluate the withdrawal schedule when test results from irradiated capsules become available or if the DCPP-1 fuel management program is significantly changed, In addition, our safety evaluation concludes that the samples from the broken weld metal Charpy specimens may be used to determine the effect of radiation and annealing, if you demonstrate that the reconstitution process does not affect the Charpy test results.
In addition, if you decide to anneal the DCPP-1 reactor vessel at some future time, all standby capsules should be annealed in order to maintain their materials in a condition equivalent to that of the reactor vessel.
This completes the staff effort on this issue and closes TAC Number H83285.
If you have any questions regarding this issue, please contact me.
Sincerely,
Enclosure:
Safety Evaluation cc w/enclosure:
See next page Harry Roo
, Senior Project Manager Project Directorate V
Division of Reactor Projects III/IV/V Office of Nuclear Reactor Regulation
I
Hr. Gregory H. Rueger Pacific Gas and Electric Company Diablo Canyon CC:
NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Dr. Richard Ferguson, Energy Chair Sierra Club California 6715 Rocky Canyon Creston, California 93432 Hs.
Sandra A. Silver Mothers for Peace 660 Granite Creek Road Santa Cruz, California 95065 Ms. Jacquelyn C. Wheeler 3303 Barranca Court San Luis Obispo, California 93401 Managing Editor The County Tel egram Tribune 1321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406 Chairman San Luis Obispo County Board of Supervisors Room 370 County Government Center San Luis Obispo, California 93408 Christopher J.
- Warner, Esq.
Pacific Gas 5 Electric Company Post Office Box 7442 San Francisco, California 94120 Mr. Hank Kocol Radiologic Health Branch State Department of Health Services Post Office Box 942732 Sacramento, California 94234 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Mr. Peter H. Kaufman Deputy Attorney General State of California 110 West A Street, Suite 700 San Diego, Cal iforni a 92101 Hs.
Nancy Culver 192 Luneta Street San Luis Obispo, California 93401 Michael H. Strumwasser, Esq.
Special Assistant Attorney General State of California Department of Justice 3580 Wilshire Boulevard, Room 800 Los Angeles, California 90010