L-82-180, Forwards Responses to NRC 800316 Questions Re NUREG-0737, Items II.F.1.4,II.F.1.5 & II.F.1.6 on Addl Accident Monitoring Instrumentation
| ML17341B140 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 05/03/1982 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM L-82-180, NUDOCS 8205070276 | |
| Download: ML17341B140 (10) | |
Text
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ACCESSION NBR:8205070276 DOG ~ DATE'2/05/03 NOTARI'ZED:
NO FACIL.50 250 Turkey Point -PlantE Uni't 3i Flor ida iPower and Li'ght 'C
'50 251 Tur key Po int.Planta "Uni;t 4p F1 or ida <<Power and Light
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'F1 arida 'Power L Li'ght 'Co,
'REC IP ~ flAQE RECIPIENT AFFILIATIQN VARGAES ~ AD Oper ating Reactor s Br anch
SUBJECT:
For wards, responses to NRC 800316, questians re NUREG 0737 Items II~ Fei' 4EII ~ F ~ 1 ~ 5.$
$ 1 ~ F ~ 1 ~ 6 on addi -acaideat moniitor ing i.nstr umentatian
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Respanse to NUREG '737/NUREG 0660 TMI Actian "Plan iRgmts (OL s)
NOTES:
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Dear Mr. Varga:
Re:
Turkey point Uni.ts 3 8 4 Docket Nos. 50-250 8 50-251 Post-TMI Requirements Additional Accident Monitoring Instrumentation Rgb]~@
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t+~4emry tIII Ct The attachment to this letter contains our responses to the questions concerning NUREG-0737 Items II.F.1.4, II.F.1.5, and II.F.1.6 provided in your letter of March 16, 1982.
Very tr ly yours, Robert E. Uhrig Vice president Advanced Systems 5 Technology REU/PKG/cab Attachment cc:
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P. O'Reilly, Region II Harold F. Reis, Esquire 8205070276 820503 PDR ADQCK 05000250 P
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ATTACHMENT Turkey Point Units 3 5 4 Docket Nos.
50-250 and 50-251 Post-TMI Requirements Additional Accident Monitoring Instrumentation gl.
.In the submittals received to date you have not indi'cated that you plan to take exception to any of the requirements of NUREG-0737.
Are you planning any exceptions of which we are not aware?
Al.
II.F.1.4 Containment Pressure Monitorin No exceptions are being taken to the requirements of NUREG-0737.
II.F.1.5 Containment Water. Level Monitor The only planned exception to the requirements of NUREG-0737 is to the measurement capacity of 600,000 gallons.
The containment sump water level monitors have the capability of measuring the total containment water up to elevation 21'-6" which is a calculated water level of 518,925 gallons.
This level exceeds the calculated water inventory of 396,440 gallons available to flood the containment to an approximate level of elevation 19'-0".
II.F.1.6 Containment Hydrogen Monitor The only planned exception to the requirements of NUREG-0737 is to the provision for the capability to selectively monitor hydrogen concentrations at different locations.
Hydrogen sampling is taken fr,om the existing containment post accident vent system and no additional containment penetrations are available to meet this new requirement to NUREG-0737.
g2.
( II.F.1.4)
What is the accuracy* of your pr essure monitor?
State this for both the indicator and the recorder.
A2.
The containment pr essure monitors are divided into two ranges to'eet the range requirements of RG 1.97.
The two ranges are -6 to +18 psig and 0-180 psig.
The indicators have an accuracy of 2.0$ of full scale and the recorder 1.0$ of full span.
Because of the maintained calibration the accuracy parameter is a 905 confidence level.
1 of 3
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Q3.
(.II.F.1.4)
What is the time response** of your pr essure monitor7 State this for both the indicator and the recorder.
A3.
The response time of the pressure monitors is 2.5 seconds for a full scale change of the pressure indicators and 1 second for a full scale change on the recorder.
Q4 ~
A4.
(II.F.1.5)
What is the accuracy* of your water level monitor7 State this for both the wide range instrument and the narrow range instrument.
The containment sump and the containment water level monitors are float operated that have a relationship within 1/2 inch of actual water level.
This produces accuracies as follows:
Containment Sum Water Level Range 390", accuracy
= 0.13$ full range System indicator accuracy
= 1.63$ full scale System recorder accuracy
= 0.63$ full span Containment Mater Level Range 90", accuracy
= 0.55$ full range System indicator accuracy
= 2.051 full scale System recorder accuracy
= 1.05$ full span Because of the maintained calibration the accuracy parameter is a 90',
confidence level.
Q5.
( II.F.1.6)
Where are the hydrogen sample ports placed'5.
The hydrogen monitor sample connections tie-in to the existing post accident containment ventilation system outside containment.
The post accident containment venti.lation sample ports are placed in two-separate pipe headers near the containment dome.
Each header contains 90; 1/4" holes.
Q6.
( II.F.1.6)
Is there any obstruction which would prevent hydrogen from the core fr om reaching the hydrogen sample ports reasonably quickly7 A6.
The hydrogen sample ports are located in the upper containment where there will be a good mixing and thus provide a representative sample of hydrogen in the containment.
In addition the shield walls layout in the containment is such that all compartments are vented to the containment dome area where the sample ports are located.
2of 3
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g7.
(II.F.1.6) i<hat is the accuracy* of your hydrogen moni,torl A7.
The accuracy of the containment hydrogen monitors is +.2$ of full scale with the instrument range of 0-101, hydrogen.
This gives a system recorder accuracy of + 2.5$ of,full span.
Because of the maintained calibration.the accuracy parameter
.is a 90$,
confidence level.
- Accuracy in control room.
'**Time response in control room.
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