ML20235X413
| ML20235X413 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 10/14/1987 |
| From: | Gagliardo J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Goldberg J HOUSTON LIGHTING & POWER CO. |
| Shared Package | |
| ML20235X201 | List: |
| References | |
| NUDOCS 8710190351 | |
| Download: ML20235X413 (4) | |
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. UNITED STATES :
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-- r NUCLEAR REGULATORY COMMISSION g
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3 E REGION IV
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' 611 RYAN PLAZA DRIVE, SUITE 1000 '
l ARLINGTON, TEXAS _76011 9,
'In Reply Refer To:
Dockets:
50-498
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Houston Lighting & Power. Company
-l ATTN:
J..H. Goldberg, Group Vice President, Nuclear P. O. Box 1700 W
Houston, Texas 77001 Gentlemen:
Facility Operating License NPF-71 for the South Texas Project, Unit 1 contains d
in Sec' tion F a, licensing condition which states that " prior.to initial-criticality, the intrusion detection system shall be proven operable to the' staff's satisfaction under' the criteria.and. reliability standards-set forth in
Regulatory Guide 5.44, Revision 2."
The criteria identified in the enclosure-to this letter will be used by Region IV in making a determination of the.
operability of the South Texas Project ' Intrusion Detection System. -
This material has been discussed with Houston Lighting and-Power Company personnel, and they have expressed understanding of the requirements of these criteria.
If you have any questions regarding this information, please contact.
Mr. Larry Yandell at (817) 860-8108.
i Sincerely, f.
Y
. E. Gagliardo, Chief Reactor Projects Branch
Enclosure:
As stated cc w/ enclosure:
(seenextpage).
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_.____._.___._-.,-__.._.u______.____________
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8, Houston Lighting 8 Power. Company -
Houston' Lighting & Power Company ATTN:
M. Wisenberg, Manager, Nuclear. Licensing.
P. 0? Box 1700-Houston, Texas 77001
. Houston Lighting & Power Company!.
ATTN: Gerald E.'Vauchn, Vice President nelear'0perations P. 0.' Box 1700~
Houston, Texas 77001.
. Texas Radiation. Cont _rol Program Director:
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l PERIMETER INTRUSION DETECTION SYSTEM (IDS) CRITERIA 1
I.
DEFINITIONS ~
I FARNAR = Combined False Alarm and Nuisance Alarm Rate.
FAR = False Alarm Rate:
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Alarms which have been generated without an apparent cause.
Investigation discloses no evidence of a valid alarm condition k
including tampering, no nuisance alarm conditions, and no i
equipment malfunction.
NAR = Nuisance Alarm Rate-Alarms which have been generated by an identified cause that does not represent a safeguards threat.
Environmental causes such as heavy rain, high winds, and electromagnetic interference (lightning) are examples of IDS nuisance i
alarms.
l Mechanical factors causing IDS alarms such as animals, blowing trash and moving vehicle traffic near IDS segments are examples of IDS nuisance alarms.
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II.
Response Criteria (a) All alarms require appropriate action to determine the cause and to c
maintain the integrity of site security.
1 (b) Alarms generated during tests for maintenance activities need not be responded to when the CAS and SAS have prior knowledge and consent of such activity.
III. FARNAR CRITERIA No more than four (4) combined false and nuisance alarms per cardinal hour per IDS zone.
IV. Detection Criteria (ref. Reg. Guide 5.44, Section C.2.b)
Demonstrate the capability to detect an intruder with at least 90%
probability in each IDS zone of the isolation zone, with 95% confidence, i
under the conditions stated in the performance criteria of each type of -
alarm system as stated in Reg. Guide 5.44.
An acceptable method for demonstrating this capability is given in the detection probability testing section of Appendix A to Reg. Guide 5.44.
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' V '.
SYSTEM AVAILABILITY CRITERI_A_-
(a) Each' single IDS zone.of the total IDS shall be operating within the' FARNAR criteria ninety five'(95%) of'the time-in cardinal hour
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increments for 30 continuous days: -that is, inoperative no more'
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than 36. hour's per zone for 30-days.
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(b) All zones of the total IDS shall be operating within the FARNAR j
criteria ninety five (95%)-of the time'for the same' continuous J
30 day.p'eriod:
that.is, inoperative no more than 1188 hours0.0138 days <br />0.33 hours <br />0.00196 weeks <br />4.52034e-4 months <br /> for:
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30 ' days based on number of zones x numberz of hours in 30 days ~x 05.
i VI. SYSTEM AVAILABILITY-ACCOUNTING.FOR IN0 PERATIVE TIME.
(a)
If the FARNAR criteria for any 7one is exceeded,.that zone shall.be i
counted as inoperable for that cardinal hour. This shall not.
include' routine required. testing or testing after maintenance.-
(b)
If the total system or individual' zones are " accessed'!.due tto -
excessive FARNAR rates or are not reset, that cardinal hour is'an inoperative hour.
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