ML19351D267
| ML19351D267 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/07/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8010090386 | |
| Download: ML19351D267 (3) | |
Text
.
O
~INNISS EZ V ALLZ'r AUTMC W
w ~ s u :c a s ~- -=2::: :n.
400 Chestnut Street Tower II October 7, 1980 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Denton:
In the Matter of the
)
Docket Nos. 50-259 Tennessee Valley Authority
)
50-260 50-296 In response to questions concerning TVA's request for changes to the Browns Ferry containment hydrogen monitoring technical specifications (BFNP TS 140) dated August 29, 1980, we provided additional information to Stan Kirslis of your staff in a September 30, 1980, telephone conversation. The enclosure documents the questions asked by Mr. Kirslis and TVA's response to each question. It is our understanding that the information provided to Mr. Kirslis resolved his concerns.
We would appreciate your expeditious approval of BFNP TS 140 to praclude impact of unit 2 startup.
Very truly yours, TENNESSEE VALLEY AUTHORITY L.' M. Mills, MafiaIer Nuclear Regulation and Safety Subscribed.and sworn to before me this '/ E day of 1980.
f
.i
-N; J l, r:.'
e w
Notary Public Of 5
My Commission Expires
~y Enclosure.
/ /
j 8 810090 3M
ENCLOSURE QUESTIONS FROM STAN KIRSLIS, NBC-NBR, REGARDING PROPOSED TECHNICAL SPECIFICATION CHANGES FOR CONTAINMENT HYDROGEN MONITORING SYSTEM
.(BFNP TS 140)
Cuestion 1 Will the new Hayes-Republic Systen reolace the present system?
TVA Response Yes Question 2 What is the accuracy of the sensors?
TVA Resconse The systen has an accuracy of two percent of full scale, (20 percent) resulting in an accuracy of four tenths of one percent.
Question 3 What is the type of pump used to " pull" a sample?
TVA Reseense i
A bellows cump with an intake capacity of 15 ft' per hour.
Question 4 What happens to the sample taken?
TVA Response The samples are exhausted back into the drywell.
Question 5 What ir the power source for the pumps that pull the sample?
TVA Response I
The cabinets containing the sensors are supplied fecm a 120-volt I&C 1
bus and the pumps are powered from a 480-volt MOV Board. All power
. circuits are safety-grade, Class 1E and will meet IEEE 270, IEEE 344 and IEEE 384
'l
r e
e t
Ouestion 6 I
What is the estimated time to pull a sample from the drywell to the sensorst t
l TVA Response i
7tth estimated length of up to 100 foot, 1/2-inch pipe, and a pump
+
with a capacity of 15 cubic feet per hour, less than two minutes is required.
l l
Ouestion 7 i
l Does the new system for hydrogen monitoring remove moisture in the l
samples?
TVA Re'>oonse Yes, the Hayes-Republic system has built-in chillers to remove moisture to ensure reliable readings and to prevent entrair. ment of l
moisture. Cooling water to the chiller will be from a seismically l
qualified system.
l Question 8 Provide clarification to the statement about two independent systems.
TVA Response l
There will be two totally independent, redundant systems for each reactor. Each system will have a hydrogen monitor for the drywell or the torus.
Question o l
Will the penetrations being used for the present hydrogen monitoring system be used by the new system?
TVA Response No, but existing spare penetrations will be used for the piping.
Question 10 l
Will the new system be capable of operating with a negative pressure?
l TVA Response l
The Hayes-Republic system will be capable of taking a sample from the drywell with a drywell pressure of -2 psig.
I I
I 1