ML14192A486
| ML14192A486 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 09/07/1984 |
| From: | Cutter A CAROLINA POWER & LIGHT CO. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML14192A487 | List: |
| References | |
| NLS-84-400, NUDOCS 8409140230 | |
| Download: ML14192A486 (4) | |
Text
REGULATORY OFORMATION DISTRIBUTION SY M (RIDS)
ACCESSION NBR:8409140230, DOC.DATE: 84/09/07 NOTARIZED: NO DOCKET #
FACIL:SO'261 H. B, Robinson Plant, Unit 2, Carolina Power and Ligh U5000261 AUTHNAME AUTHOR AFFILIATION COTTERA.B.
Carolina Power.& Light Co.
RECIPNAME, RECIPIENT AFFILIATION VARGAS.A.
Operating Reaetors Branch 1
SUBJECT:
- Forwards Supph,2 to XN-NF-84-72, *"Large Break LOCA"EGCS Analys!s W/Increased Ethalpy Rise FActor:K(Z) gurve" &
revised Tech Spec Page 3.10w22,reflectihq substit ted K(Z) curveFper 8407 u3request re. C cle; 1 0 DISTRIBUTION CODE: AS D CElV CR N
TITLE:
OR Submittal: General Distributi NOTES:
05000261 0L:07/31/70 RECIPIENT COPIES RECIPIENT COPIES I0 CODE/NAME LTTR ENCL:
ID CODE/NAME LTTR ENCL NRR ORBI BC 01 7
7 INTERNAL: ADM/LFMB.
1 0
ELD/HDS1, 1
0 NRR/DE/MTEB I
1 NRR/DL DIR 1
1 NRR/DL/ORAB 1
0 NBSA 8
1 1
N.RR/DSI/RAB 1
1 rjE G F 04 1
1 RGN2 1
1 EXTERNAL: ACRS 09 6
6 LPDR 03 1
1 NRC PDR.
02 1
1 NSIC 00 1
1 NTIS 1
1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL 23
Carolina Power & Light Company SERIAL:
NLS-84-400 S EP 0 7 1984 Director of Nuclear Reactor Regulation Attention:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing United States Nuclear Regulatory Commission Washington, DC 20555 H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-261/LICENSE NO. DPR-23 SUPPLEMENTAL REQUEST FOR LICENSE AMENDMENT -
CYCLE 10 REVISED K(Z) CURVE
Dear Mr. Varga:
SUMMARY
AND BACKGROUND By letter dated July 23, 1984, Carolina Power.& Light Company (CP&L) provided the NRC with the plans for operation of the H. B. Robinson Steam Electric Plant Unit No. 2 (HBR2) during Cycle 10 and requested revisions to the Technical Specifications (TS) for HBR2.
Confirmatory analyses performed following that submittal indicated that a change to the previously submitted K(Z) Curve was required. This letter provides a substitute K(Z) Curve for that submitted previously.
DISCUSSION While verifying the previously submitted K(Z) Curve, CP&L/Exxon determined that with an F of 1.65 at a burnup of approximately 9MWD/KgU, HBR2 would be AH required to turn on the Axial Power Distribution Monitoring System (APDMS) for the remainder of Cycle 10.
Since the operation of this system is incon venient, time consuming and has other operational impacts, a new burnup dependent curve was developed for the elevation above the six-foot level. The new curve will limit the operational impacts by reducing the need to implement APDMS while retaining adequate margins of safety.
While confirming the analyses which produced the original K(Z) Curve, it was determined that in the event of a LOCA it would be possible to exceed a peak clad temperature (PCT) of 2200 0 F. Reanalyses have produced a more conservative curve which meets the criterion for PCT remaining below 2200aF during LOCA events.
Because the new curve is more conservative than the original, CP&L believes prenoticing is not required.
- P.
411 Fayetteville Street 0 P. 0. Box 1551 o Raleigh, N. C. 27602
Mr. Steven A. Varga
-2 Please find attached a revised page 3.10-22 which replaces the previous page 3.10-22 submitted with our July 23, 1983 TS request.
Should you have any questions regarding this matter please call Mr. Sherwood R. Zimmerman at (919) 83 6-6242.
Yours very ruly, A. B. Cutter -
Vice President Nuclear Engineering & Licensing DCS/ccc (5660NH)
Attachment cc:
Mr. J. P. O'Reilly (NRC-RII)
Mr. G. Requa (NRC)
NRC Resident Inspector (RNP)
Attorney General (SC)
Mr. Heyward G. Shealy (SC)
A. B. Cutter, having been first duly sworn, did depose and say that the information contained herein is true and correct to the best of his information, knowledge and belief; and the sources of his information are officers, employees, contractors, and agents of Carolina Power & Light Company.
Ntary (Seal)
My commission expires: M omswr~*
1.2 LARGE BREAK CURVELAGBRKCUV 1.0 (0.5,1.0)
FUEL ROD BURNUP
>9 MWD/kgU LARGE BREAK CURVEe(0..82 0.8-FUEL ROD BURNUP (0.9,0.80)
<9 MWD/kgU 0.6 0
z SMALL BREAK LIMITING 0.4 (1.0,0.36) 0.2I I
I I
I I
0 1.20 2.40 3.60 4.80 6.00 7.20 8.40 9.60 10.80 12.00 ELEVATION IN CORE (ft)
NORMALIZED AXIAL DEPENDENCE FACTOR FOR Fa 2.32 VERSUS ELEVATION FOR FAH21. 6 5 Figure 3.10-3