ML20236S698
| ML20236S698 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 11/19/1987 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML19302D098 | List: |
| References | |
| RTR-NUREG-0809, RTR-NUREG-809 NUDOCS 8711300041 | |
| Download: ML20236S698 (2) | |
Text
+.
as DUKE POWER GOMPANY l'
' 7" P.O. Box 33189 citARLOTTE, N.o. 28242 HALM. TUCKER' Truenorrs '
vsos raammeur (704) 373-4531 wuotm4a enonwrson November 19, 1987-IU. S. Nuclear. Regulatory Commission.
Attention: Document Control Desk Washington' D.:C. 120555
~
Subject:
Catawba Nuclear Station, Units 1 and 2 Docket Nos. 50-413 and 50-414
- RTD Bypass System Removal
Dear Sir:
1In response.to Dr.
K.' Jabbour's letter of November 6, 1987, please find attached additional'information'concerning the elimination of the Resistance Temperature
' Detector (RTD)-Bypass System'at Catawba.
i
.This letter" constitutes a response lfor the'. Catawba-Nuclear, Station only. A I
response for'the McGuire Nuclear Station (as' requested in'Dr. Jabbour's letter)
-will be' submitted separately.
Inlthe July 22,;1987 submittal associated with proposed Technical Specification changes relative to RTD Bypass Manifold removal, Table 3.3-2 revised the required response times for the Delta-T trip functions from 4 seconds to 7 seconds. The 7 second response time consisted of.5.5 seconds for the RTDs and thermowells and
- 1.5 seconds for.the electronic delays. Although the safety analysis had assumed
'an 8 second response (6 seconds for RTD/thermowell and 2' seconds for electronics)
~
as discussed in Attachment VI'of the July 22, 1987 submittal, the.7 second response time requirement'was thought to be achievable and the proposed revision used 7 seconds and introduced 1 second of added margin!in the analyses.
Recent testing at another plant after completion of the RTD Bypass System removal modification has resulted in. response times slightly greater than 5.5 seconds. Given the likelihood ~that Catawba may also have difficulty in
. satisfying the 5.5 second RTD/thermowell response time criteria, it is deemed Jprudent to utilize the available margin prior to completion of the modification.
The revised proposed change to Table 3.3-2 reflects the values justified in the safety analysis provided in Attachment VI of the July 22, 1987 submittal (6.0 seconds for the RTD/thermowell and 2.0 seconds for the electronic delays). Since the safety analysis supporting the July 22, 1987 submittal assumed the 8 second.
L response time, no additional analyses are required to justify the proposed revision to 8 seconds.
The necessary revisions to the July 22, 1987 submittal are provided (Technical Specification.pages 3/4 3-1 and 3/4 3-7 and FSAR Table 7.2.1-3, page 1).
~Also enclosed is a revision to Technical Specification page 3/4.3-1.
This change is'in response to'the guidance provided in NUREG-0809 concerning frequency of
. testing for RTD's.
L 8711300041 871119 V
PDR - ADOCK 050004131 I
gi P
^
- d: s - l l-U. S. Nuclear R:gulatory Commission l
-Nov:mber 19, 1987 Page Two
-?
l Since this letter 1s in response to.an NRC Staff request for additional
~
information, no application fee is required.
Please note.that several of these responses contain information which is proprietary to Westinghouse. As outlined in Duke's July 22, 1987 letter it is requested that this information be withheld from public disclosure.
Very truly yours,
/
O Ad /
L //./
Hal B. Tucker RWO/160/sbn Attachment xc:
Dr. J. Nelson Grace, Regional Administrator U. S.~ Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. Heyward Shealy, Chief Bureau of Radiological Health South Carolina Department of Health &-
-Environmental Control 2600 Bull Street Columbia, South Carolina 29201 American Nuclear Insurers c/o Dottie Sherman, ANI Library The Exchange, Suite 245 270 Farmington Avenue Farmington,~CT 06032 M&M Nuclear Consultants 1221 Avenue of the Americas New york, New york 10020 INPO Records Center Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 l
Mr. P. K. Van Doorn NRC Resident Inspector j
Catawba Nuclear Station
_ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -