ML20033F052
| ML20033F052 | |
| Person / Time | |
|---|---|
| Site: | University of Iowa |
| Issue date: | 02/21/1990 |
| From: | IOWA STATE UNIV., AMES, IA |
| To: | |
| Shared Package | |
| ML20033F049 | List: |
| References | |
| NUDOCS 9003150323 | |
| Download: ML20033F052 (3) | |
Text
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PAGE REVISIONS FOR AMENDMENT No.-1
'i
-Revision Set # 1 SAR' Amendment - 4 s
1
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- o j.'s 003150323 900307 I DR' hDOCK OSO k
i (rev1,'2/21/90)
Introduction - la
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Table 4.1-1 (M) Continued
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Rod Worth-(% Ak/k).
Regulating Rod 0.26 Shim: Safety Rod 0.45 1
Safety Rods 0.45 Rod-Speed
.Re99 ating~(in./ min) 27 Shim Safety and Safety Rods:
Withdrawal Rate (in./ min) l6
. Scram (complete insertion) 0.5 s or less Control Rods Material Boral Size-8 x 7 x 1/8 Shim Safety'and Safety (in)
-Regulating'(in) 2 x 2 x 1/8 Maximum Reactivity. Input Rates (l)
(% Ak/k/s).
1 Regulating Rod 0.012 Shim Safety Rods 0.0044 Safety. Rods '
0.0044-
--Reactivity Effects; D
Fuel Loading.
' i 4
(%.Ak/k/g)
+0.0043 o
-Moderator Temperature' i
Coefficient (% Ak/k/K)..
-0.019 Fuel: Tem)erature Coefficient L
(%' Ak/ </K)
.-0.0013-K
-Void Coefficient.
(%'Ak/k/% void)
-0.22 Procsis Water; j
Cenductivity-(micromhos/cm) 1 F1ow:(gpm)'
10 Minimum Temperature ( F) 70~
Normal-Inlet Temperature (O )
-80
[
F Normal Outlet Temperatue at 10 kW (O )
87 F
(I) HEU values are measured.
Ratios of maximum to average
-(measured from HEU core) are used to calculate LEU values, q
6 (rev 1, 2/21/90)
SAR Amendment - 4
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l 4.2 Reactor Section 4.2.1 (D) (H)
J (b) Excess Reactivity and Shutdown Marain -- The maximum allowable excess reactivity during. cold, clean (poison-free) operation of the reactor is 0.5%
Ak/k, well below thai, needed for a prompt critical excursion.
The minimum shutdown margin, with the best safety-type rod assumed unavailable, is greater than 0.35% Ak/k.
This shutdown margin is sufficient to shut down tra reactor from any operating condition as demonstrated in the analysis of power transients (l) with appropriate safety system response.
To be conservative, the back-up shutdown reactivity provided by draining the moderator from the L
core tanks has not been included, although the operability of the dump valve is a limiting condition for operation in the Technical Specifications. The L
design of, and operating experience with the control elements give evidence of exceptional reliability in performing their intended function.. The slowest of the the control elements consistently is fu?ly inserted from a completely
. wlthdrawn position in less than 450 milliseconds after the initiating trip E
signal (2),
L The performance capabilities or the control elements are periodically.
. measured with an electronic timer circuit in conjunction with the "up" and l
"down" limit switches (3). Dump valve opening time is measured, also.
Measured withdrawl, insertion, and opening times are compared with previous data to
- detect trends which would indicate deterioration of performance.
l l
(1) Reactivity Insertion, Section 6.3.
(2)The Technical Specification limit is 600 milliseconds.
(3)Suveillance requirement in the Technical Specifications.
l SAR Amendment - 5
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