ML14192A320

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Submits Revised Criteria Re ESF Override Per IE Bulletins79-01B & 80-06 & NUREG-0578,in Response to Re Purging & Venting of Containment.Modified Drawings Encl
ML14192A320
Person / Time
Site: San Onofre, Robinson  
Issue date: 02/08/1982
From: Zimmerman S
CAROLINA POWER & LIGHT CO.
To: Varga S
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0578, RTR-NUREG-578 IEB-79-01B, IEB-79-1B, IEB-80-06, IEB-80-6, NUDOCS 8202160384
Download: ML14192A320 (27)
v • d • e


Text

'REGULATORY 4FORMATION DISTRIBUTION SY M (RIDS)

ACCESSION N8R:8202160384 DoCDATE: 82/02/08 NOTARIZED: NO DOCKET #

FACIL:,50-261 H. 1. Robinson Plant, Unit 2, Carolina Power and Ligh 05000261 AUTH.NAME AUTHOR AFFILIATION ZINWERMANSR, Carolina Power.& Light Co.

RECIP.NAME RECIPIENT AFFILIATION VARGArS.A.

Operating Reactors Branch 1

SUBJECT:

Submits revised criteria re ESF override per IE Bulletins79-01B & 80-06 & NUREG-0578,in rpsponse to 811221 Itr re purging & venting of containment.Modified drawings encl.

DISTRIBUTION CODE.: A001S COPIES RECEIVED:LTR ENCL I..SIZE:

TITLE: General Distribution for after Issuance of Operating License NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL ACTION:

ORB #1 BC:

01 13 13 INTERNAL: ELD 1

0 IE 06 2

2 NRR/DHFS DEPYO8 1

1 NRR/DL DIR 1

1 NRR/DL/ORAS 1

0 NRR/DSI/RAB 1

1 0'4 1

1 EXTERNAL: ACRS 09 10 10 LPDR 03 1

1 NRC PDR 02 1

1 NSIC 05 1

1 NTIS 1

1 TOTAL NUMBER OF COPIES REQUIRED: LTTR 35 ENCL 33

CP&L Carolina Power & Light Company FES 08 1982 SC2i98 Office of Nuclear Reactor Regulation ATTN: Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 U. S. Nuclear Regulatory Commission F$

Washington, D.C. 20555 H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-261 LICENSE NO. DPR-23 ENGINEERED SAFETY FEATURES OVERRIDE

Dear Mr. Varga:

In a March 21, 1980 letter from Mr. Schwencer, your office requested that Carolina Power & Light Company (CP&L) commit to six criteria for the safety signals to the Engineered Safety Features at H. B. Robinson (HBR) Unit No. 2. These six criteria were addressed by CP&L in an April 29, 1980 letter to Mr. Schwencer. As a result of recent discussions between your staff and our staff, we revised our responses to address the specific concerns of your staff.

This issue was addressed in your letter dated December 21, 1981 regarding Purging and Venting of Containment. At the request of your staff, we are addressing this issue separately.

.The following is a listing of the six criteria and how CP&L meets each.

Criterion 1 In keeping with the requirements of General Design Criteria 55 and 56, the overriding of one type of safety actuation signal (e.g., radiation) should not cause the blocking of any other type of safety actuation signal (e.g., pressure) for those valves that have no function besides containment isolation.

Response

The Engineered Safety Features (ESF) were originally designed such that an actuation signal could be overridden so that the emergency equipment could be controlled at the component level.

While in override, a second ESF signal, if initiated, would not automatically actuate the emergency equipment.

A modification to prevent the override of the ESF in the Containment Ventilation Isolation (CVI),

Containment Isolation (Phase A

& B),

Containment Spray, and Feedwater Isolation Systems has just been implemented.

This modification deletes the override function from the applicable circuits.

CP&L meets the requirements of Criterion 1 at HBR.

411 Fayetteville Street o P. 0. Box 1551 e Raleigh, N. C. 27602 8202160384 e20208 PDR ADOCK 05000261,.

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Criterion 2 Sufficient physical features (e.g., key lock switches) are to be pro vided to facilitate adequate administrative controls.

Response

A cover was temporarily installed over the Containment Ventilation Isolation, Containment Isolation (Phase A and Phase B), Containment Spray, and Feedwater Isolation RESET buttons.

The cover consisted.of a flapper which had to be lifted before the buttons could be engaged.

This prevented inadvertent actuation of these resets by requiring the operator to take deliberate action to utilize the RESET feature.

Following the above modification, which removed the capability to override the above four systems, physical features are not required and this temporary cover has been removed.

CP&L meets the requirements of Criterion 2 at HBR.

Criterion 3 A system level annunciation of the overridden status should be provided for every safety system impacted when any override is active (see R.G. 1.47).

Response

The Engineered Safety Features have.been modified to provide an annun ciator "Automatic SI.Override" and status light "Automatic SI.Overridden A/B" in the Control Room. The SI system is the only system now capable of being overridden.

CP&L meets the requirements of Criterion 3 at HBR.

Criterion 4 Diverse signals should be provided to initiate isolation of the Contain-.

ment Ventilation System. Specifically, containment high radiation, safety injection actuation, and containment high pressure (where contain ment high pressure is not a portion of safety injection actuation) should automatically initiate CVI.

Response

Specifically, CVI is initiated by either a containment high radiation signal or a Safety Injection signal.

The containment high pressure actuates a Safety Injection signal.

CP&L meets the requirements of Criterion 4 at HBR.

It should be noted that the containment high radiation signal is not part of the ESF system at HBR.

Criterion 5 The instrumentation and control systems provided to initiate the ESF should be-designed and qualified as safety grade equipment.

Response

All engineering safeguard instrumentation and control systems used to initiate the ESF are designed and qualified to the safety grade standards existing during the design and construction of HBR Unit No. 2. These instrumentation and control systems have been reviewed as required by IE Bulletin 79-01B and are considered qualified to perform their safety function as described in the HBR FSAR.

CP&L meets the requirements of Criterion 5 at HBR.

It should be noted that the containment high radiation monitor system and signal to the CVI system is not by design part of the ESF system and, therefore, is not safety grade. It is, however, on the HBR Q-list.

Criterion 6 The overridding or resetting of the ESF actuation signal should not cause any valve or damper to change position.

Response

All equipment, including valves and dampers, that are actuated by an ESF actuation signal (ESFAS) has been reviewed in accordance with NUREG-0578 and I. E.Bulletin 80-06. Equipment identified during this review that would change state on overriding or resetting of the ESFAS has been modified such that it will not change state on override or reset of ESFAS.

CP&L meets the requirements of Criterion 6 at HBR.

Enclosed are the drawings of the Engineered Safety Features as modified to prevent the overriding of Phase A and B C.V. Isolation, C.V. Ventilation Isolation, Containment Spray, and Feedwater Isolation.

If you have any questions concerning this subject, please contact my staff.

Yours very truly, S.

Zimmerman Manager Licensing & Permits DCW/lmr (7141)

Enclosures cc:

Mr. J. P. O'Reilly (R-II)

Mr. W. J. Ross

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