ML19208C047
| ML19208C047 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/17/1979 |
| From: | Fry D, Kryter R, Zigler G OAK RIDGE NATIONAL LABORATORY, SCIENCE APPLICATIONS INTERNATIONAL CORP. (FORMERLY |
| To: | |
| Shared Package | |
| ML19208C045 | List: |
| References | |
| NUDOCS 7909240451 | |
| Download: ML19208C047 (2) | |
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Three Mile Island - 2 f.
Tech.iical Support l'
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Dia;nostic Instrumentation i
D. N. Fry, et al.
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Problem:
L Provide TNI on-site expert technical assistance with special diagnostic l
instrumentation as,mrt of a special instrumentation group (SIG). The r
group charter is:
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Collect the maximam amount of diagnostic data consistent with not interfering
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with operations in either the Control Room or cable spreading areas. No I
safety circuits will be accessed and all hookups to plant systems must have i
the agreement of the instrumentation technican on duty in the cable spreading room. All efforts will be coordinated with the control room.
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If and when plant instrumentation signals are lost, the special instrumentation group is to aid operations by determining whether laboratory or special instrumentation might be used to obtain the desired data.
Description of Work Performed:
I The group made frequent measurements and diagnostic evaluations over the period from April 3 to April 30, 1979.
Direct current, strip chart, 3
t and spectr ; analytic measurements were made of 1) In-core thermocouples (approx. 50); 2) Reactor Coolant Pressure: 3) In-core self-powered neutron detectors; 4) Ex-vessel neutron detectors. The two principal concerns i
which depended heavily on these diagnostic measurements were boiling in the core and entrained or trapped gas in the primary system. Two to five l
people were at the site during this period to provide immediate assistance n
j to operations as needed.
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Conclusions and Results:
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The measurements and recommendations of this group were very helpful t
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in degassing the primary system and in determining that satisfactory
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natural convection cooling had been established after the coolant pumps were I
deactivated.
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Separate detailed reports have been prepared describing the measurements made and their significance.
Wor Requested L
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NRC-TMI (Stello, Ackerman).
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Results Reported Tc:
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NRC and GPU as timely.
I Kork Perfomed by D. N. Fry, R. C. Kryter, G. L. Zigler (SAI), C. M. Smith, W. H. Sides, S. J. Ball, J. C. Robinson (TEC).
Estimated Costs:
Approximately 60 Mandays plus a variety of transportation to and from the site with people and equipment; $35,000.
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