ML14192A160
| ML14192A160 | |
| Person / Time | |
|---|---|
| Site: | Robinson  |
| Issue date: | 03/09/1981 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Jackie Jones Carolina Power & Light Co |
| References | |
| NUDOCS 8103170003 | |
| Download: ML14192A160 (2) | |
Text
ORB#1 Rdg OELD NRC PDR DEisenhut AEOD L PDR RPurple IE-3 TERA RTedesco ACRS-16 NSIC GLainas Gray File Docket No. 50-261 SVarga 8
TNovak co DNeighbors CParrish Mr. J. A. Jones Senior Vice President Carolina Power & Light Company g
336 Fayetteville Spree Raleigh, North Carolina 27604 R
Ir
Dear Mr. Jones:
By letters dated April 25 and August 23, 19 ncerning H. B. obinson Steam Electric Plant, Unit No. 2 you proposed modifications to the con trols for certain critical ECC motor operated valves.
The proposed modifications are designed to eliminate operator actions outside of the control room, to preclude sin e faifu e Involving spurious valve operation, and to avoid any unintendedoperator action that would result in loss of cooling capability. The modifications to the valve con trols include:
(1) the addlion of a separate control power loc out switch; (2) valve position indication that is not deenergtied by control power lockout; and (3) redundant valve position indication, The control power lockout scheme conforms to the single failure criterid.
Therefore, the design of the valve control satisfies the req uirements of EICSB BTP 18 of the Standard Review Plan.
The 1ollowin6 valves were identified'as being required for emergency long-te mcooling of the core and as not satisfying the single failure criterion.
- 3.
Valves 864 A & B SI Supply from RWST
- 4.
Valves 866 A & B Hot Leg SI
- 5. Valve 869 Hot Leg SI In the event of a loss-of-coolant accident, the valves identified in items one-through four must change position during the switchoverfrom injection to recirculation flow.
The controls for these valves were to be modified.
The licensee also proposed to modifyhe c ontrols for the vialve identified in item five to eliminate the need for operator action -outside of the con trol room in the event this va ve has to be opeiated.
Mr. J. A. Jones
-2 Based on our review, we find that the modifications to the valve motor control circuitt Aatisfy the single failure criterion. We, therefore, conclude that the design is acceptable.
Your letter dated Septamber 26, 1980 proposed changes to the Technical Specifications for the valves discussed in 1 through 4 above. However, you have -ot pirovided surveillance requirements for these vFales_
We request that you propose surveillance requirements for these valves (See the enclosed Standard Technical Specification for guidance).
Please provide your response within 45 days of receipt of this letter.
Sincerely, rP-igital signed bYz arga Steven A. Varga, Chief Operating R actors Branch Il Division of Licensing Standard Technical Specification cc w/enclosure See next page OFFICE0 ORB#1 :DL ORB
-D SURNAMEh ors S**
/8
- I NRC FORM 31810/80)NRCM240 OFFICIAL RECORD COPY USePO 129.824