ML20085F512
| ML20085F512 | |
| Person / Time | |
|---|---|
| Site: | Saxton File:GPU Nuclear icon.png |
| Issue date: | 09/06/1967 |
| From: | Neidig R SAXTON NUCLEAR EXPERIMENTAL CORP. |
| To: | |
| Shared Package | |
| ML20083L048 | List:
|
| References | |
| FOIA-91-17 NUDOCS 9110220186 | |
| Download: ML20085F512 (5) | |
Text
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SAXTON NUCLEAR EXPERIMDJTAL CORPORATION DOCKET No. 50-146 LICENSE DPR-4 Arendment No. 1 to Change Request No. 27 x
1.
Applicant hereby sutrnits Amendment No.1 to Change Request No. 27 supplying additiona) infor: nation requested in Division of Reactor Licensing letter of
.tgust 23, 1967.
SAXTON NUCLZAR EXPERIMENTAL CORPORATION
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R. E. Neidig President,
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QUPSTION 1 lIhat will be the ph range within which you will operate during the test?
How does this range compare with previously approved ranges used during pH testo?
ANSilER Section N.4.b.(6) of Supplement No.1 to the Saxton Technical Specifications was amended by Change No.15 to pemit pH tests at Saxton based on total alkali concentration in the primary coolant. Saxton now operates not on a pH range but on an alkali concentration range of 0 - 3 2x10-4 molal.
This concentration range will not be changed for the test.
Based on prirnry coolant containing 500 ppm boron (as H BC ) and 0 - 3.2x10-4 3 3 molal lithium (as LiOH), the calculated pH range during the test will be 4.95 - 6.48 at 77 F and 5.5 - 7.5 at 5300F.
l
,, W QUESTION 2 Discuss procedures to be followed to assure that no thermal limits will be exceeded when performing pH tests at power levels above 23.5 K4t.
ANSWER A series of tests have been conducted at WAPD to determine the effects of crud; on DNB. The experimental data obtained from these tests are presented in Table 1.
Table 1 Nominal Test Conditions
/q"DNB, **#8"##
Mass Ratg)of Flgs sq"DNB' P#*
- D
- /
Iressure Inlet
(#/hr ft x 10 psia Temp., 'F Clean Tube Crudded Tube 1.055 1.174 2000 480 1.5 1.055 1.287 l.135 1.204 1.242 2000 480 2.5 1.179 1.391 1.277 2000 550 1.5 1.156 1.407 2000 550 2.5 1.152 1.258 Results'obtained from simultaneous crud; injection and DNB testing.
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1 Answer to Question 2 (continued) j l
The results indicate that the DNB heat flux it increased when a crud layer exists on the fuel rod surface.
Other studies (1) have been conducted to determine the effect of crud deposit on the heat transfer coefficient and wall temperature in the boiling re61me.
These tests indicate the wall temperature was lower in nucleate boiling for a given heat flux when crud deposit existed as compared with clean surfaces.
Thus, there is no significant effect on the heat transfer in the boiling
- region, pH tests conducted at Saxton at 15 MWt, 20 MWt and 23 5 MWt have demonstrated that the resctor power level has a negligible effect on the magnitude of the reactivity chsnge. Therefore, no appreciable diff erence is expected at the 35 MWt power level.
I The initial pH tests will be conducted with the test subassembly located in the periphery of the core at a power level of 23.5 MWt. The measurec parameters, i.e., reactivity coefficients, fuel temperatures and powe r distribution will be campared with predicted values.
If significant differencea are found, the tests will be terminated until an evaluation of the dif ferences can be made.
From the above statements, it is concluded that new procedures are not needed to assure that thermal limits are met when performing pH tests at power levels above 23.5 MWt.
(1) Diccussion by P. Cohen and G. R. Taylor, Westinghouse Electric Corporation on paper by W. C. Elrod, J. A. Clark, E. R. Lody and H. Merte, " Boiling Heat Transfer Data at Iow Heat Flux", ASME Paper No. 66 WA/HT-19.
..o,
l QUESTION 3 What is the maximum rate at which pH can be changed? What is the estimated reactivity addition rate corrasponding to this change?
ANSWUt The primary coolant pH can be increased 2.0 units (at 530 F) in approximately one-half hour, which is the time required for charging lithium hydroxide solution from the purification system surge tank.
Based on observations made at Saxton during more than 15 tests, the reactivity change resulting from this pH change begins slowly, increases to a maximum rate, then again becomes slow - in sigmoidal fushion.
The typical total reactivity change at Saxton for this pH change is 0.2% ak/k. The maximum reactivity insertion rate is typically 0.017% Ak/h per hour.
It requires between 10 and 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> for the total reactivity change to occur following adjustment of coolant pH.
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