ML20003F442
| ML20003F442 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 04/13/1981 |
| From: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.30, TASK-TM A01379, A1379, NUDOCS 8104210253 | |
| Download: ML20003F442 (2) | |
Text
l NOR1MEAST UTHJTIES I hhhhhfb$
1 t <L===;=
April 13, 1981 Dh D
Docket No. 50-213
(( ((g Y K A01379 L
g c %o r12 V
.a t
D. G. Eisenhut, Director
' E.
9' Division of Licensing s/
Office of Nuclear Reactor Regulation V.
P N
U. S. Nuclear Regulatory Commission Washington, DC 20555
Reference:
(1)
W. G. Counsil letter to D. G. Eisenhut, dated December 15, 1980.
Gentlemen:
Haddam Neck Plant
'1NI Action Plan Requirement II.K.3.30 In Reference (1), Connecticut Yankee Atomic Power Conpany (CYAPCO) documented its plans regarding the plant specific response to 'IMI Action Plan Item II.K.3.30.
Even though Appendix K to 10CFR Part 50 is not applicable to the Haddam Neck Plant because zircaloy clad fuel is not utilized, CYAPCO identified its intention to respond to the intent of this requirement. A synopsis of the methodology and cceputer codes which were to be used to fulfill this requirement were also provided in Reference (1).
Since the docketing of Reference (1), CYAPCO initiated a dialogue with cognizant Staff personnel with the intention of optimiting our respective resources on this task. Certain plant unique complications preclude the possibility of utilizing generic activities which have been initiated by the NSSS vendors on this action plan requirement. The resulting schedular differer.ces from those identified in N1JREG-0737 also support the need for a plant specific dialogue on this subject.
CYAPC0 and Northeast Utilities Service Company (NUSCO) personnel attended a meeting between Yankee Atomic Electric Company and the NRC Staff in January, 1981 to obtain specific information regarding Staff concerns with existing small break LOCA models. With that background information, a meeting between CYAPCO and Staff was held in Bethesda on March 10, 1981 to further amplify the basis for its position and to solicit Staff concurrence with che CYAPC0 program and schedule. As a result of that meeting and subsequent telephone discussions, it is our understanding that a mutually acceptable position has been reached. The purpose of this sutaittal is to document that position such that the Staff vill provide written concurrence regarding this action plan requirement. CYAPCO intends to have this submittal serve as the basis for written concurrence.
By the end of the calendar year 1982, CYAPCO intends to submit the thermal-hydraulic portion of the small break LOCA model using the RELAP-5 cceputer code. Included with that submittal vill be a verification of the steam 8104210 1
.?
. cooling heat treasfer coefficient with experimental data. Eased upon previous analyses and otr engineering evaluations of the emergency core cooling systems at the Haddam Nect Plant, this portion of the small break LOCA model vill be sufficient to complete nmall break LOCA spectrum analysis since no core uncovery is expected.
Nonetheless, it is also our intention to develop fuel performance and transient heatup codes to complete the small breat LOCA model development program. The carrent schedule for this portion of the task calls for completion by July 31, 1983 As-su=ning that the abote efforts are completed as scheduled, a plant specific spectrum, i.e. completion of TMI Action Plan Requirement II.K.3 31, vill be docketed by the end of the calendar year 1983.
The justification for the schedular delay as compared to the requirements of NUREG-0737 was provided in detail during the March lo, 1981 meeting. Justification included plant unique features including upper plenum injection and stainless steel cladding, compliance with the interim acceptance criteria (IAC) rather than Appendix K, and the lack of applicability of ongoing USSS vendor gene;-ic activities. In addition, the CYAPC0 program is consistent with our corporate plans to enhance in-house analysis capabilities.
CYAPC0 emphasizes that the above schedule for complying with the requirements of II.K.3.30 represents an accelerated effort and a significant resource ec=mitment.
It is not possible to docket a more rigid commitment than that discussed above because the RELAP-5 computer code is not currently available for use on ou; computer system, and it is, therefore, inappropriate to be more specific regarding the schedule for completion.
It remains our intention to conduct technica1 meetings on a periodic basis to ensure Staff concurrence with our program.
We trust you find the above information sufficient to provide written concurrence with the above surmarized program content and schedule.
Very truly yours, CONNECTICUT YAIEGE ATOMIC POWER COMPANY
/ 'lld W.'G.
Council Senior Vice President