L-87-227, Advises That Util Will Propose Amend to License NPF-16 by 870930 to Revise Surveillance Requirements of Tech Spec 4.7.1.5 to Change Time Required for Full MSIV Closure.Amend Will Ensure Consistency W/Philosophy in Establishing Spec
| ML17219A626 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 06/09/1987 |
| From: | Woody C FLORIDA POWER & LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| L-87-227, NUDOCS 8706160457 | |
| Download: ML17219A626 (6) | |
Text
R LA Y INFORMATION DIBTRI TI SYSTEM (RIDS)
ACCESSION NBR: 8706160457 DOC. DATE: 87/06/09 NOTARIZED:
NO FACIL: 50-389 St.
Lucie Plant Unit 2 Florida Power 8c Light Co.
AUTH. NAME AUTHOR AFFILIATION WOODYi C. O.
Florida Power 5 Light Co.
RECIP. NAME RECIPIENT AFFILXATION Document Control Branch (Document Control Desk)
SUBJECT:
Advises that'til will propose amend to License NPF-16 bg 870930 to surveillance requirements of Tech Spec
- 4. 7. i. 5 to change time required for full MSXV closure. Amend will make MSIV Spec consistant w/philosophy used in MFIV Spec.
DISTRIBUTION CODE:
- OOID COPIEB RECEIVED: LTR I
ENCL + BITE:
TITLE:
OR Submittal:
General Distribution DOCKET 05000389 REC IP IENT ID CODE/NAME PD2-2 LA TOURIQNY> E COPIES LTTR ENCL RECXPXENT ID CODE/NAME PD2-2 PD COP IES LTTR ENCL INTERNAL'RM/DAF/LFMB NRR/DEBT/ADS NRR/
ILRH FILE Oi EXTERNAL:
EG8(G BRUSKEi S NRC PDR NRR/DEBT/ADE NRR/DOEA/TSB OGC/HDS2 LPDR NSIC TOTAL NUMBER OF COPIES REQUIRED:
LTTR 18 ENCL P5
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JUNE L-87-227 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Gentlemen:
Re:
St. Lucie Unit 2 Docket No. 50-389 Main Feedwater Isolation Valve Closure Time By letter L-83-349, dated June 17, 1983, Florida Power Bc Light Company proposed a license amendment requesting various administrative(editorial changes and a change to the steam generator pressure/temperature limit. By letter L-84-148 dated June 4,
1984, FPL proposed a license amendment for Cycle 2 operation which bounded "stretch" power operation (i.e. to upgrade rated core power from 2560 MWt to 2700 MWt). "Stretch" power operation was proposed subsequently by FPL letter L-84-354, dated November 21, 1984.
The bounding operation proposal of June 4,
- 1984, was issued as Amendment No. 8 on November 9,
- 1984, and "stretch" power was approved by Amendment No. 9 dated March I, 1985.
By letter dated March I I, 1987, (E. G. Tourigny to C. O. Woody) the NRC issued Amendment No.
18 to the St. Lucie Unit 2 Facility Operating License No. NPF-16.
This amendment consisted of changes requested in FPL's June 17,
- 1983, application, with the exception of the proposal to revise the main feedwater isolation valve (MFIV) closure time to 4.2 seconds.
The staff noted that it believes the MFIV closure time of Technical Specification 4.7.1.6 should be 4.0 seconds instead of 4.2 seconds and took no action on this aspect of the application.
FPL was requested to respond to its intended disposition of this issue.
The issue of MFIV closure time proposed in our June 17, 1983, submittal had been superceded by our "stretch" power amendment proposals.
The MFIV full closure time of 5.15 seconds currently specified in the Technical Specifications continues to be a correct value as determined by St. Lucie Unit 2 accident analyses.
As a result, FPL does not propose to revise this Technical Specification.
FPL believes that the OPERABILITY of the MFIVs is verified by performance of testing which confirms the ability of these valves to shut within the time limit required by the "stretch" power accident analyses.
This value is 5.15 seconds for St. Lucie Unit 2.
If full valve closure is accomplished within this time frame, regardless of valve stroke time, then the accident analyses, which assume MFIV closure, are confirmed.
The ability of the MFIVs to isolate within 5.15 seconds is conducted and verified periodically in accordance with Specification 4.3.2.3.
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U. S. Nuclear Regulatory Commission L-87-227 Page two Main Steam Isolation Valve (MSIV) Technical Specification 4.7.1.5 requires full MSIV closure within 5.6 seconds, considering only valve stroke time.
The MSIV full closure time assumed by the "stretch" power accident analyses is 6.75 seconds.
If full valve closure of the MSIVs is accomplished within this time frame, regardless of valve stroke time, then the accident analyses which assume MSIV closure are confirmed.
The ability of the MSIVs to isolate within 6.75 seconds is conducted and verified periodically in accordance with Specification 4.3.2.3.
Based on the above, FPL will propose an amendment by September 30, 1987 to the St.
Lucie Unit 2
Facility Operating License to revise the Surveil lance Requirements of Specification 4.7.1.5 to change the time required for full MSIV closure to 6.75 seconds.
This amendment willmake MSIV Specification consistent with the philosophy used in establishing the MFIVSpecification.
If additional information is required on this topic, please contact us.
Very truly yours, C
. Woody Group Vice President Nuclear Energy COW/EJW/gp cc:
J. Nelson Grace, Regional Administrator, Region 11, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant EJW4/029/2
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