ML20211H131
| ML20211H131 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 02/19/1987 |
| From: | Wisenburg M HOUSTON LIGHTING & POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| ST-HL-AE-1888, NUDOCS 8702260082 | |
| Download: ML20211H131 (4) | |
Text
The Light (OE Mf flouston 1.igluing & lbwer 1:0. Ih>x 1700 llouston. 'lexas < s oul (713) 228-9211 February 19, 1987 ST-HL-AE-1888 Filo No.: C9.17 10CFR50 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 Annotated FSAR Revisions Concerning the Essantial Cooling Water System Enclosed are annotated FSAR revisions to FSAR Section 9.2.1.2.5 concerning the screen wash controls for the essential cooling water system.
These changes do not appear to change any conclusion currently documented in the Safety Evaluation Report. These revisions will be incorporated into FSAR amendment No. 58 and are provided for the staff's immediate use.
If you should have any questions on this matter, please contact Mr.
M. E. Powell at (713) 993-1328.
M. R. Wisenburg Deputy Project Manager MEP/yd
Attachment:
Annotated FSAR Revisions to Section 9.2.1.2.5 DO 5
A Ll/NRC/wb j
0 p0 Ifl
ST-HL-AE-1888 G9.17 Houston I.ighting & Power Company f.:
cc:
Regional Administrator, Region IV M.B. Lee /J.E. Malaski
. Nuclear Regulatory Commission City of Austin 611 Ryan Plaza Drive, Suite 1000 P.O. Box 1088 Arlington, TX 76011 Austin, TX 78767-8814 N. Prasad Kadambi, Project Manager M.T. Hardt/A. von Rosenberg U.S. Nuclear Regulatory Commission City Public Service Board 7920 Norfolk Avenue P.O. Box 1771 Bethesda, MD 20814 San Antonio, TX 78296 Robert L. Perch, Project Manager Advisory Committee on Reactor Safeguards U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue 1717 H Street Bethesda, MD 20814 Washington, DC 20555 Dan R. Carpenter Senior Resident Inspector / Operations c/o U.S. Nuclear Regulatory Commission P.O. Box 910
. Bay City, TX 77414 Claude E. Johnson Senior Resident Inspector /STP c/o U.S. Nuclear Regulatory Commission P.O. Box 910 Bay City, TX 77414 M.D. Schwarz, Jr., Esquire Baker & Botts One Shell Plaza Houston, TX 77002 J.R. Newman, Esquire Newman & Holtzinger, P.C.
1615 L Street, N.W.
Washington, DC 20036 T.V. Shockley/R.L. Range Central Power & Light Company P. O. Box 2121 Corpus Christi, TX 78403 i
i Ll/NRC/wb Revised 2/3/87
STP FSAR bnrrier to prevent the uncontrolled leakage of radioactivity to the environ-With the small amount of CCWS-to-ECWS leakage which may be tolerated mnt.
for proper system operation and the high flowrates in the ECWS, radiation datectors in the ECUS would serve no useful function because of detector sen-citivity limitations.
Instead, a radiation monitoring system is provided in l39 the CCWS to detect leakage past the first barrier.
9.2.1.2.4 Tests and Inspections: The ECWS will be tested in accordance 39 with Chapter 14 requirements.
System surveillance requirements are discussed in the Technical Specifications.
9.2.1.2.5 Instrument Application: Actuation of the ECWS is discussed in Section 7.3.
Control switches are provided for manually starting or stopping ruut each ECW pump from the control room. Upon a LOOP or actuation of a safety l2 A i injection (SI) signal, all three ECW pu=ps are automatically started by the ESF load sequencers.T hri.m
..~ml v ec & a dvu, a n D~ ' p = p i; c r o...aticall,. A tcrt:".t Upon actuation of an SI star a wuen iu a -.o d CCW yw m signal, the ECW blowdown isolation valves are automatically closed.
An alarm for high ECW s' elf-cleaning strainer and ECW pump lube strainer dif-39 forential pressures is provided in the control room.
A ecr - - M ntrol system is provided to automatically start and stop the traveling screens during normal operation.
A high differential water level boo Sh f-I m t sensed across the traveling screenj d utomatically starts the screen wash M p e f Dr t c1 4 Alarms are furnished in the control room to alert the operatorCb
=,2 of high differential water level across any traveling screena s::::n _..u The traveling er s y r::: 9, -,, -. n i c..-
r;i b. e r
-i cma m, screens D ooster. opes pumpsf ^-'
bare automatically acti-h9 8
1 nd " " - rr; a vated on receipt of an SI signal. (threz;h 9 N A level-recording system with control room readout is provided for the ECP.
h9 Annunication of low-level signals are available in the control room.
ECW pump 52 discharge pressure and ECUS inlet and outlet water temperatures are monitored
- remotely, l.ocal pressure, differential pressure, and temperature indicators are provided to monitor the parameters of the ECUS.
Thermal relief valves are provided at the ECWS inlet or outlet no :le on each l39 HX to prevent overpressurization in the event ECW flow is blocked when the HX Table 9.2.1-4 lists those relief valves in the ECWS for which is in service.
Code Case N-242 is permitted. This code case provides alternate rules which 56 may be used for the acceptance of metallic materials which were not 26 manufactured or supplied in complete conformance with the rules of NCA-3800 (or NA 3700) and which are used in the construction of items for which the epplicable code is Winter 1973 Addendum or later. The valves are listed by tag number.
9.2.2 Component Cooling Water System 9.2.2.1 Design Bases.
The Component Cooling Water System (CCWS) meets the requirements of 10CFR50, Appendix A, General Design Criteria 1, 2, 3, 4, 39 5, 44, 45, 46, 54 and 57.
STP Units 1 and 2 have separate but identical CCUSs.
l 9.2 9 Amendment 56 1
= - -
Inserts for Page 9.2-9 Insert A During normal operation, the standby ECW pump (s) and its associated CCW pump are starte automatically due to low header pressure in eitherCCW/orECW.
Insert B
... and after reaching adequate screen wash pressure starts the traveling screen. The screen wash valve is opened whenever the booster pump is running.
.