ML20003E838
| ML20003E838 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/10/1981 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| TAC-43369, NUDOCS 8104170337 | |
| Download: ML20003E838 (4) | |
Text
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eswun SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 S Street, Box 15830, Sacramento, California 95813; (916) 452 3211 April 10, 1981 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors, Branch 4 U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Docket 50-312 Rancho Seco Nuclear Generating Station, Unit No.1 Additional Information Cycle 5 Reload
Dear Mr. Stolz:
In your letter of April 6,1981, you requested additional information on the Rancho Seco Unit 1 Cycle 5 Reload Report. The answers to the questions in your letter and additional information on several items requested in recent telephone conversations with members of your staff are provided in the attachment.
1 Sincerely, l
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John. Mattimoe Assistant General Manager and Chief Engineer Attachment i@
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RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RANCHO SECO UNIT #1 CYCLE 5 RELOAD REPORT BAW-1667 1.
Question Please indicate the EAB and LPZ doses to the thyroid and whole body considering:
- 1) Steam line failure outside the reactor building
- 2) Steam generator tube failures with loss of offsite power
- 3) Fuel handling accident
- 4) Control rod injection
- 5) Loss of coolant accident
- 6) Maximum hypothetical accident Rcsponse The requested information is shown in the table on the following page.
i
COMPARISON OF FSAR AND CYCLE 5 ACCIDENT DOSES FSAR Doses Cycle 5 Doses Accidents (Rem)
(Rem) 1.
Steam Line Break Thyroid Dose at EAB 2.54 2.64 Whole Body Dose at EAB 0.009
.0118 Thyroid Dose at LPZ 0.155
.19 Whole Body Dose at LPZ (0.001
.00086 2.
Steam Generator Tube Failure Thyroid Dose at EAB 9.15 9.47 Whole Body Dose at EAB 0.132
.279 Thyroid Dose at LPZ 0.339
.692 Whole Body Dose at LPZ 0.009
.0204 3.
Fuel Handling Accident Thyroid Dose at EAB 4.76 5.96 Whole Body Dose at EAB 0.399 1.11 Thyroid Dose at LPZ 0.291 0.41 Whole Body Dose at LPZ 0.024
.081 4
Rod Ejection Accident Thyroid Dose at EAB 3.11 3.42 Whole Body Dose at EAB 0.004
.0058 Thyroid Dose at LPZ 0.191
.578 Whole Body Dose at LPZ (0.001
.0019 5.
LOCA Thyroid Dose at EAB 3.28 2.61 Whole Body Dose at EAB 0.01
.018 Thyroid Dose at LPZ 0.201
.379 Whole Body Dose at LPZ (0.001
.0067 6.
MHA Thyroid Dose at EAB 137.
102.1 Whole Body Dose at EAB 3.6 3.35 i
Thyroid Dose at LPZ 8.4 13.8 Whole Body Dose at LPZ 0.229 0.64 I
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References 1.
Letter from D. B. Vassallo, USNRC, to J. H. Taylor, B&W, June 12, 1978.
2.
Letter from J. H. Taylor, B&W, to D. B. Vassallo, USNRC, December 13, 1978.
3.
Letter from S. A. Varga, USNRC, to J. H. Taylor, B&W, March 12, 1978, 4.
Letter from J. H. Taylor, B&W, to S. A. Varga, USNRC, March 27, 1979.
5.
Letter from J. H. Taylor, B&W, to S. A. Varga, USNRC, June 22, 1979.
Item 1 - Cladding Collapse, Cladding Stress, and Cladding Strain In each case, the analysis shown in the Reload Report is bounded by the results of previously approved analyses.
Item 2 - Fuel Pin Pressure at E0C The comments made in the letter from James Taylor (B&W) to Paul Check (NRC) on July 18, 1978, which provide justification for the use of TAFY in thermal hydraulic analyses, apply 'o this Reload Report.
Item 3 - Control Rod Guide Tube Wear The generic report on control rod guide tube wear (BAW 1623) is applicable to Rancho Seco.
Item 4 - Fuel Assembly Holddown Springs After four cycles of operation at Rancho Seco, no failures have been observed. Furthermore, B&W has conducted an evaluation of the heats of metal used to manufacture the holddown springs in the Rancho Seco core and determined that none of the material comes from heats that have experienced failures at other facilities, item 5 - Axial Blanket Lead Test Assemblies l
The same approved standard methods were used for analysis of regular and axial blanket lead test assemblies. A copy of reference 1, the DOE Progress Report, is attached.
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