ML18086B460

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Forwards Addl Info on RCS Vents,Tmi Action Item II.B.1,per 820223 Request
ML18086B460
Person / Time
Site: Salem  PSEG icon.png
Issue date: 04/28/1982
From: Liden E
Public Service Enterprise Group
To: Varga S
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.B.1, TASK-TM NUDOCS 8205040378
Download: ML18086B460 (3)


Text

PS~G Public Service Electric and Gas Company 80 Park Plaza Newark, N.J. 07101 Phone 201/430-7000 April 28, 1982 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, MD 20014 Attention: Mr. Steven A. Varga, Chief Operating Reactors Branch 1 Division of Licensing Gentlemen:

REACTOR COOLANT SYSTEM VENTS (ITEM II.B.l)

UNITS 1 AND 2

~SALEM NUCLEAR GENERATING STATION DOCKET NO. 50-272 AND 50-311 This letter transmits to you, in its enclosure, the additional information on Reactor Coolant System Vents (Item II.B.l), requested by your letter of February 23, 1982.

Should you have any questions in this regard, do not hesitate to contact us.

Very truly yours,.

Enclosure

~

~1anager - Nuclear Licensing cc Mr. Leif Norrholm / and Regulation NRC Senior Resident Inspector Mr. William J. Ross NRC Licensing Project Manager

~. 8205040378 820428 PDR ADOCK 05000272

.p PDR The Energy People 95*2001 (400M) 1*81

REACTOR COOLANT SYSTEM VENTS (ITEM II.B.l)

REQUEST FOR ADDITIONAL INFORMATION

1. FSAR Section 4.2.3 provides pertinent details about PORV's, which perform the function of pressurizer venting.
2. PORV's provide the means for pressurizer venting and a procedure for such an application is included within the Station Emergency Instructions for "natural cir-culation".
3. Pressurizer vent capability has been demonstrated un-der the relief valve test program, conducted by EPRI for PSE&G and other participating utilities. The re-actor vessel head vent is sized to vent 1/2 gas volume of the RCS in one hour.
4. (a) Piping, valves, and components for the vent are classified as Seismic Category I and Safety Class 2.

(b) Design pressure and temperature of the piping valves and components are 2485 psi and 650°F, respectively.

(c) Each PORV and PORV block valve has indicating lights in the control room to indicate position.

Temperature display and alarm are also provided in the control room from the common pressurizer header. The pressurizer relief tank has pres-sure, temperature, and level indications and alarms in the control room.

(d) Maximum conditions (pressure and temperature) for the vent piping are as specified in PSE&G's specifications, which meet the intent of SRP Section 5.2.3 requirements.

(e) The 3/4" reactor head vent line was analyzed not as a source but as a target for HELB. The nor-mally pressurized portion of the pressurizer vent system is located within the pressurizer missile shield. The effects of internal missiles on these lines have been analyzed and found accept-able.

5. Failures (a), (b), (c), and (d) of the head vent and pressurizer vent have been analyzed and found not to prevent essential operation of safety-related systems required for safe reactor shutdown or mitigation of the consequences of a design basis accident.
  • 6. Pressurizer vent paths have been evaluated and shown not to result in inadvertent opening or failure to close after initial opening.
7. The PRT rupture disc is the vent path for both the reactor vessel head and the pressurizer vent. The annulus area containing the PRT is well ventilated.

With a postulated 3 out of 5 fan coil units running at reduced speed during an accident condition, the annu-lus area containing the PRT is adequately ventilated with an air change every hour. A review of possible sources of ignition in the immediate vicinity of interest indicates no concern. Venting through the PRT rupture disc will not adversely affect any system or component essential for safe shutdown.

8. Operability testing of the reactor vessel head vent valves will be performed in accordance with subsection IWV of Section XI of the ASME Code for Category B valves. Operability testing of the pressurizer PORV's is currently performed in accordance with subsection IWV for Category B valves.
9. All displays (including alarms) and controls added to the control room as a result of the requirement for reactor coolant system vents will be considered in the human factors analysis performed in response to NUREG-0700.

MRD/FAM:nj 4/28/82 PC 16 01/02