ML20237H743
| ML20237H743 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 08/11/1987 |
| From: | Capstick R VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Rooney V NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM), Office of Nuclear Reactor Regulation |
| References | |
| FVY-87-78, NUDOCS 8708170337 | |
| Download: ML20237H743 (3) | |
Text
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VERM,0NT YANKEE NUgLEAR POWER CORPORATION RD 5, Box 169, Ferry Road, Brattleboro, VT 05301
,,pty,g ENGINEERING OFFICE y
1671 WORCESTER ROAD FRAMINGHAM, MASSACHUSETTS 01701 TELEPHQNE617 872-8100 August 11, 1987 FVY 87-78 United States Nuclear Regulatory Commission Document Control Desk-Washington, DC 20555 Attention:
Office of Nuclear Reactor Regulation Mr. V. L. Rooney, Senior Project Manager Project Directorate I-3 Division of Reactor Projects I/II
References:
(a) License No. DPR-28 (Docket No. 50-271)
(b) General Electric Standard Application for Reactor Fuel (GESTARII), NEDE 24011-P-A-8, May 1986, as Amended (c) Letter, USNRC to VYNPC, SER, dated November 27, 1981 (d)
Letter, USNRC to VYNPC, SER, dated September 15, 1982 (e) Letter, USNRC to VYNPC, SER, dated September 27, 1985 (f) General Electric Company "LOCA Analysis Report for Vermont Yankee Nuclear Power Station," NEDO-21697, August 1977 (g) Letter, USNRC to VYNPC, SER, dated November 30, 1977 (h) Letter, VYNPC to USNRC, FVY 87-67, " Proposed Technical Specification Change for Cycle 13 Operating Limits -
Proposed Change No. 139," dated June 24, 1987
Subject:
Clarification of Vermont Yankee Cycle 13 Core Performance Analysis Report (YAEC-1600)
Dear Sir:
By letter, dated June 24, 1987 [ Reference (h)], Vermont Yankee submitted a proposed Technical Specification change for Cycle 13 operating limits. The basis for the Vermont Yankee Cycle 13 licens2.;3 analysis was provided by the Vermont Yankee Cycle 13 Core Performance Analysis Report, YAEC-1600, enclosed with our June 24, 1987 submittal.
Pursuant to recent discussions with the NRC staff associated with the review of Vermont Yankee Cycle 13 submittal, we have been requested to clarify certain sections of the Cycle 13 Core Performance Analysis Report (CPAR).
Accordingly, Vermont Yankee herein provides the requested information pertaining to Section 7.0 and Table 7.2.1.
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8708170337 B7g2 1 j
DR ADOCK O p
- United States Nuclear Regulatory Commission August 11, 1987 Attention
Mr. V. L. Rooney, Sr. Project Manager Page 2 The staff requested clarification of whether the. transients reported in Section 7.0 of the Vermont Yankee Cycle 13 CPAR are the limiting transients.
A review and reanalysis of the Anticipated Operational Occurrences (A00s) which set MCPR operating limits for Vermont Yankee during Cycle 13 operation is reported in Section 7.0 of YAEC-1600. The events reported are limiting; no other A00s would produce more restrictive MCPR operating limits for Cycle 13.
The second request was to include the lowest allowable minimum Critical Power Ratios (1.07) associated with each a CPR values for the transients identified in Table 7.2.1.
This table is provided in Attachment A.
We trust that the information provided by this letter adequately clarifies the Vermont Yankee Cycle 13 Core Performance Analysis Report in response to your request.
Should you have any questions or require further information regarding this matter, please contact this office.
Very truly yours, VERMONT YANKEE NUCLE POWER CORPORATION f
R. W. Ca stick Licensing Engineer RWC/25.55 Enclosure i
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o VY CYCLE 13 TRANSIENT ANALYSIS RESULTS Peak Peak Avg.
Prompt Power Heat Flux (Fraction of (Fraction of Delta Delta CPR +
Transient Exposure Initial Value)
Initial Value)
Turbine Trip E0FPL 2.732 1.236
.20 1.27 Without Bypass,
" Measured" E0FPL-1000 2.155 1.152
.14 1.21 Scram Time E0FPL-2000 1.409 1.023
.03 1.10 1
-Turbine Trip E0FPL 3.026 1.278
.25 1.32 Without Bypass, "67B" E0FPL-1000 2.518 1.208
.20 1.27 Scram Time E0FPL-2000 1.760 1.077
.07 1.14 Generator Load E0FPL 2.695 1.224
.19 1.26 Rejection Without Bypass, EOFPL-1000 2.116 1.141-
.13 1.20
" Measured" Scram Time EOFPL-2000 1.333 1.003
.01 1.08 Generator Load E0FPL 3.101 1.280
.25 1.32 Rejection Without Bypass, E0FPL-1000 2.565 1.210
.20 1.27
'"673" Scram Time E0FPL-2000 1.742 1.065
.06 1.13 Loss of 1000F E0FPL 1.213 1.205
.17 1.24 Feedwater Heating E0FPL-1000 1.222 1.214
.18 1.25 EOFPL-2000 1.223 1.216
.18 1.25-BOC 1.211 1.203
.17 1.24 l
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